EP 01A Story That Had Already Begun Before Anyone Realized ItTaichi Yaegashi, Iori Nagase, Himeko Inaba, Yoshifumi Aoki and Yui Kiriyama are all members of the Cultural Research Club. One day, Yoshifumi and Yui claim to have temporarily switched bodies the previous night. Although everyone is pretty sceptical of this, it is soon proven to be real when Taichi suddenly switches bodies with Iori and gets hit on by the class president, Maiko Fujishima. After spending the rest of the afternoon convincing Himeko what had happened is real, they eventually switch back to their original bodies.
EP 02Some Fascinating HumansThe next morning, Himeko, Yoshifumi and Yui all switch bodies together, though soon revert to normal. After the gang make up excuses for their teacher, Mr. Goto, Taichi briefly ends up switching places with Yui before getting grilled by Iori over what happened whilst he was in her body. Just then, the gang is approached by someone who had swapped bodies with Mr. Goto, calling himself Heartseed, who is revealed to be responsible for the body swapping, vaguely explaining the situation before leaving. Following the encounter, the group discuss how best to handle the situation without making anyone else suspicious. A week later, as Iori swaps bodies with Yoshifumi, she talks with Taichi about how the switching may affect their individuality before she switches back. The next day, as Taichi and Himeko switch and end up having to go on class duty with Maiko, Himeko decides to get revenge against Taichi and declare to Maiko that Iori is hers whilst in Taichi's body.
EP 03Jobber and Low BlowAs Taichi questions Himeko about what she said in front of Maiko, she implies to Taichi that he has feelings for Iori whilst also worrying about how the body swapping could eventually break them. Later, Taichi and Yoshifumi learn that Yui has a fear of men. That night, as Taichi switches with Yui, she revealed she gained that fear after almost being raped in middle school, believing there was no way she could beat a man in a fight. Wanting to help her get over her fear, Taichi teaches Yui about the one weakness that all men possess; the crotch. The next day, as Yui becomes a bit more confident and decides to take up martial arts again, Himeko suddenly collapses before Taichi.
EP 04Twin FeelingsAs Taichi and Iori escort Himeko home, the girls get Taichi to spill the beans about what happened between him and Yui, leaving Iori a bit shocked as she was unaware of Yui's androphobia. After dropping Himeko off, Iori tells Taichi about the troubles she faced due to her mother constantly getting remarried, constantly changing her personality to fit the tastes of others that she had forgotten who she originally was, feeling that the personality swapping would cause her to just fade away. The next day, Taichi confronts Himeko, who eventually she reveals that she can't trust that noone will use another's body to perform evil deeds, hating herself for feeling that way. As Taichi tells Himeko she doesn't need to change who she is to be accepted by others, he tells her a secret that he's thought of her and the other girls in a sexual manner. Moved by his confession, Himeko decides to share her issues with the others and finds the others accept her.
EP 05A Confession and Death......Yoshifumi once again confesses to Yui, explaining the reasons why he likes her, to which she replies that she's not ready to go out with anyone just yet. Afterwards, Iori, pretending to have swapped places with Himeko, asks Taichi how he feels about her, to which he says he likes their current relationship before Himeko walks in, revealing it was Iori all along. As Iori runs off, Taichi realises his folly and chases after her, finding her on a bridge over the river. Taichi tells Iori how he admires her, whatever personality she puts herself in before confessing that he loves her. Just then, Iori's body is taken over by Heartseed, who forces her to jump off into the river. As Iori is put in intensive care, Heartseed, in Goto's body, appears before the others and tells them that Iori's body will soon die, giving them thirty minutes to decide amongst themselves whose soul will die with it, giving them the ability to switch bodies on verbal request. As Iori swaps with Yoshifumi and learns of the situation, she offers to die with her own body, not willing to sacrifice anyone else. As she spends time talking to everyone individually, she confesses to Taichi that she loves him too, asking to kiss him whilst in Himeko's body. As the group make their decision to Heartseed, it is revealed that Iori had managed to survive, the whole thing being planned out by Heartseed. As Iori recovers from her injuries and returns to school, the gang assume the body swapping has stopped whilst Himeko gets revenge on Taichi for stealing her first kiss.
EP 06A Story That Continued Before Anyone Realized ItThree weeks following the body swap incident, Taichi and Iori have yet to have a chance to talk alone since the club has been busy writing a paper. One day, as Taichi and Himeko are alone in the clubroom, Himeko suddenly starts stripping and making advances on Taichi before they are interrupted by Yui, who suddenly smashes the table without realising it. Later that night, both Taichi and Iori end up doing things unconsciously, though it does give them a chance to finally talk about the confession. Later, the gang learn that Yui and Yoshifumi had been taken into police custody after Yui had beaten up some guys hitting on some girls. As Taichi, Iori and Himeko discuss the voices they had been hearing in their heads, Heartseed appears again, explaining that they are being put through a new phenomenon in which their bodies will impulsively act on their deepest desires. As the gang discuss how they need to be more careful to try and not get innocent people involved, Himeko hides her doubt from the others. Later, Iori calls Taichi to tell him they should put off dating until the phenomenon is over.
EP 07Falling ApartAs the other grow concerned about Yui, who hasn't shown up at school since the incident, Himeko tells Taichi he could be in danger if his desire to help others is unleashed. As the others visit Yui the next day, she reveals her worries that she might end up hurting others again, but Himeko ends up unleashing her desire to scold her, stating her belief that they could all be in danger if they don't satisfy Heartseed's desire for entertainment. As Himeko tries to keep herself out of situations, Taichi's desires cause him to argue with her and reprimand her for being a coward.
EP 08And Then There Were NoneAs Himeko distances herself from the others, concerns over Yui cause Taichi and Yoshifumi to argue with each other. When Iori tries to stop them from fighting, Taichi's desires cause him to inadvertently injure her. As the class makes plans for a field trip, Iori becomes worried as both Himeko and Taichi are becoming more distant from her. As Mr. Goto asks Taichi to help him carry some school equipment, he suggests he turn to his friends for advice while Maiko suggest he consider what is most important to him.
EP 09Can’t Stop Can’t Stop Can’t StopTaichi apologises to Iori and tells her that he would rather stay with his friends and risk hurting them than distance himself from them. After making up with Iori, Taichi also manages to make up with Yoshifumi but Himeko is still avoiding them. Recalling how the bodyswapping allowed Taichi to help Yui with her androphobia, he and Yoshifumi assure Yui that their desires can be controlled with enough will and convince her to attend school again. Meanwhile, Heartseed appears at Himeko's house, bringing to light her withheld feelings that she fears could tear apart the group if revealed.
EP 10Putting into WordsAs the school goes on the field trip to the mountains, Himeko remains concerned over what Heartseed had told her. As Iori takes notice, she learns that Himeko also has romantic feelings for Taichi. As Iori confronts Himeko, she reveals she never acted on her feelings as she didn't want the group to fall apart, believing noone would want a weakling such as herself. Iori tells her to stop putting herself down and reassures her that she'll always be her friend despite her flaws. Just as they make up, Heartseed possesses Iori and tells Himeko that Taichi had been in an accident, causing Himeko to panic believing he had fallen down a cliff. Upon discovering had simply fallen off a tree whilst rescuing a kitten, remaining relatively unscathed, Himeko breaks down in tears out of relief. With the desire unleashing phenomenom declared over, Himeko decides to confess to Taichi and, despite getting rejected, remains confident in the fact she may one day win against Iori and gives him a kiss.
EP 11A Story That Began As We Realized ItOn the day before Winter break, following a brief period of peace after the unleashing of desires, a new phenomenom takes place in which Yui and Iori temporarily revert to a younger age during 12pm and 5pm that day. After returning back to their normal age, they lose memory of what happened, but remember things from when they were that age. Later that night, a second Heartseed appears before Taichi through his sister's body, tasking him with watching over the others and warning him not to tell the others about his existence. The next day, Taichi stumbles upon Yui who is argued at by an old karate rival, Chinatsu Mihashi, over breaking a certain promise which she can't remember. As the gang meet up at an abandoned building, this time Himeko and Yoshifumi shrink, with the now ten-year old Yoshifumi likening Yui to a girl named Nana Nishio. After reverting to his normal age, Yoshifumi explains Nana was a girl he went out with once before she moved, leading him to be conflicted over how his feelings for both her and Yui stand. The next day, as Taichi and Himeko watch over a 14-year old Iori, Himeko voices her worries.
EP 12Into a Snowy CityAs the gang have to look after Iori who winds up as a baby, Yui is confronted by Chinatsu, who challenges her to a karate match and defeats her. Meanwhile, Yoshifumi ponders if his feelings for Yui are because of her similar appearance to Nana. On the second day of the New Year, Yui reverts to right after she was assaulted and, upon returning to normal, remembers vividly about that age. As Yui refuses to talk things out with Chinatsu, Yoshifumi tells her to stop running away from her problems. Talking with Taichi, Yui reveals her promise with Chinatsu was to meet each other at the national karate tournament, which she was unable to keep after contracting her androphobia, and laments how weak and reliant she has become. After sending Yui home, the others speak with Yoshifumi, who remembers his personal vow to live carefree and decides to go visit Nana to tell her about his love for Yui. Afterwards, Yoshifumi reconfirms to Yui that he loves her for who she is.
EP 13As Long as the Five of Us Are TogetherAs Taichi is forced to tell the others what he had been hiding, the second Heartseed reminds them of the consequences, making the age reverts random and including Taichi amongst those who can turn younger. As the gang are forced to stay at the building to avoid others discovering themselves, Iori becomes stressed when she believes her mother to be in danger from her violent second husband, who wants to get back together with her. After briefly turning younger for a short period and regaining memories of that age, Iori tries to head off on her own but the others stop her, asking her to let them help. As Tacihi, Iori and Himako reach the house and hear violent noises, they are forced to retreat after Iori turns into a baby. Just then, the first Heartseed approaches them, ending the age revert phenomenom and offering Iori the opportunity to go back in time and rectify some of the bad decisions she made in her youth. After some encouragement by Taichi and Himeko, Iori declines his offer, saying her past mistakes have allowed her to become the person she is now. Afterwards, everyone goes with Iori to see her mother, where they both realise they had both made mistakes trying to make the other happy. After Iori's mother gains the encouragement to turn her ex-husband away, Iori gives thanks to everyone who made her who she is whilst Yui apologises to Chinatsu, promising to meet her at the next karate tournament. As winter vacation comes to an end, Iori starts to question if she truly loves Taichi.The five members of the Cultural Research Club - Taichi Yaegashi, Iori Nagase, Himeko Inaba, Yui Kiriyama, and Yoshifumi Aoki - encounter a bizarre phenomenon one day when Aoki and Yui switch bodies without warning. The same begins to happen to the other club members, throwing their daily lives into disarray. At first the five students find some amusement amidst the confusion, but this unwarranted connection also exposes the painful scars hidden within their hearts. As their calm lives are shattered, the relationships between the five students also begin to change... (Source: Crunchyroll, edited)
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