During Valentine's Day of their last year of junior high, Mayaka's attempt to get Satoshi to accept her feelings fails, which Satoshi attributes on the quality of the chocolate she made. This year, she asks for Eru's help to make an even better chocolate than the last. Meanwhile, Houtarou runs into Satoshi at a city arcade, and contemplates on the fact that Satoshi seems to have lost his competitiveness from the year before. While shopping for materials, Mayaka asks Eru if she likes anybody; Eru replies and the answer seems to surprise Mayaka, but the answer itself isn't heard. On Valentine's Day, Eru tells Houtarou that the chocolate project was a success, and begins to explain to him that her family doesn't usually exchange presents with people they're close to, subsequently implying that she might have wished to give Houtarou something for Valentine's. Because Mayaka had to stay with the Manga Society, she leaves the chocolates in the clubroom with Eru, but a distressed Eru comes to Houtarou with Satoshi, telling him that while she had left the room, the chocolate had been stolen. Houtarou attempts to figure out who would have stolen it, but he already has an idea. Mayaka arrives at the clubroom, only to be discouraged by the disappearance of the chocolate, and she goes home. After Eru outbursts at him, Houtarou tells her to go home, and that he believes a member of the Astronomy Club had stolen it. Alone, he confronts Satoshi, proving that he is the culprit; Though Satoshi admits to it, Houtarou demands that he explain why. Satoshi explains that, though he does want to be with Mayaka, he had stopped becoming obsessed with everything, and couldn't risk becoming obsessed with her. Houtarou is still angry that he had hurt Eru in the process, but when Satoshi admits that his plans aren't as successful as Houtarou's, Houtarou acknowledges that he can't understand him. It is revealed that earlier, Eru had caught up to Mayaka, who admitted that she knew Satoshi had stolen it, afraid of giving her an answer, and tells Eru that Houtarou lied to protect him. Eru realized that Houtarou might have lied for her sake as well. Later that night, she thanks Houtarou for his help, and Satoshi calls Mayaka, telling her that he has something to speak to her about.