Em busca da definição científica de "amor", Himuro e Yukimura, que acreditam estar apaixonados, fizeram experimentos numa viagem a Okinawa, mas os dados se mostraram insuficientes para que chegassem a uma conclusão. Precisam de mais dados, mas as análises levam tempo. À procura de resultados mais rápidos, eles acabam conhecendo outro casal apaixonado...

Os exaustivos testes de nível de oxitocina apontam para a conclusão de que o casal Himuro e Yukimura não se ama tanto quanto o casal Fujiwara e Florette. Yukimura considera tal conclusão inaceitável, e procura uma explicação alternativa que melhor abarque sua hipótese inicial.

Kanade convida Ibarada e Himuro para uma "noite das garotas", e o experimento acaba se voltando contra ela. Alguns dias depois, enquanto Yukimura abre os olhos de uma viciada sem esperança, parte do Laboratório Ikeda vai a um show para testar uma forma de se aproximar mais de artistas no palco.

Depois da grande confusão em Okinawa com a mangaká Yamamoto, finalmente o mangá do relacionamento de Yukimura e Himuro é publicado. Com isso, em breve os pesquisadores terão uma grande quantidade de dados relacionados ao que se sente ao amar alguém.

Depois de muitos experimentos, Himuro se declara novamente para Yukimura, desta vez com mais certeza do que antes. Qual é a teoria que a fez ter tanta certeza assim?

After worrying long and hard over what to do about Shikijou's invitation to go hang out together, Kanade decides to try going on the date with him. When Himuro hears about it she leans forward excitedly to congratulate Kanade on finding someone she might fall in love with. Himuro is also eager to observe and analyze Kanade's date from afar in order to put it to good use in her own research. As she's thinking about this, Yukimura arrives and proclaims that he has devised a new standard unit for the measurement of favorable feeling, the Kanade love power. Then, Kanade's date becomes a double date!

Kosuke enjoyed his date with his beloved Aika. They did things like shop for clothes and watch a movie. In the midst of his fun, Kosuke watched Kanade, her date, and a lot of other couples up close. He ends up being made aware he was the only one playing with dolls, and the feeling makes him scream and cry. Meanwhile, Kanade is still in shock from the words Shikijou said to her on their date: "You didn't seem normal." Seeing this, Yukimura asks Kanade for the definition of "normal," and declares that living with an obsession about being "normal" is a truly stupid way to live.

The Ikeda Lab is, as is traditional, doing something for the university's Mutsumi Festival, an event which draws many people from off-campus. Yukimura proposes conducting a large-scale experiment on the importance of appearance for romance. He has readied a large number of cosplay costumes to rent out to visitors who will then participate in an attractiveness rating. In order to emphasize how important appearance is, Yukimura projects a series of images of Himuro in cosplay on the screen, including Himuro in a nurse's uniform, a maid's uniform, and a black cat style outfit?!

When Himuro finds out that Yukimura spends time alone in a room with a high school girl for his part-time home tutoring job, she becomes intensely worried that he might be ogling his student. That student, Haru, isn't good at studying. Her average score on her end of term exams was 38 points. When Yukimura personally witnesses Haru's father disparaging her as a failure, he... Later, the Mutsumi Festival begins and twin sister cosplayers who are brimming with youthful energy arrive at the Ikeda Lab's cosplay experience.

At the Mutsumi Festival, Kosuke and the others debate the relationship between wearing wedding dresses and the age at which a person gets married. Yamamoto, with her thirties closing in on her and also due to pressure from her parents, relentlessly proposes marriage to Kosuke. After outrunning Yamamoto, Kosuke turns to look back and finds Ibarada standing there wearing a wedding dress. When a child asks, "Aren't you getting married?" Ibarada and Kosuke reply by... Meanwhile, Kanade, who had been looking around the Mutsumi Festival with Shikijou, coldly turns away from Yukimura and tells Shikijou that she doesn't know him.

After Kanade rejects his confession of love, Shikijou presses her for a reason, grabbing her arm and saying, "This isn't normal. This isn't like you." Kanade throws him by reflex, then Shikijou flies into a rage and turns a stun gun on her! When Kanade slowly regains consciousness, she finds herself in a dimly lit abandoned warehouse where a group of delinquents are chatting and laughing. Kanade's hands and feet are tied with rope, so she can't move. Shikijou moves closer to her saying, "Kanade-san, you aren't normal right now. We have to reform you."