バレンタインデーの日、優は俊夫にチョコを渡そうと張りきるが、俊夫はマミがチョコをくれるから公園へ行くと言い、ふたりは大喧嘩してしまう。公園に行った俊夫だが、現われたのは隣のクラスの篠田まみだった。一方、優はケンカの後、昔俊夫と遊んだ思い出の場所に来ていた。
Tetsuo and Natsume look on with delight as Yuu prepares some home-made chocolate before deciding to playfully tease her as if she were a small child clumsy in the kitchen before Yuu derails them with the mention of the »ingredient of love« as she joins Posi and Nega on the roof; after the love spirit infuses her chocolate, Nega explains Yuu that the epilogue is a reflection of her efforts going forward. Galvanized by the data of home commute conclusion much to his social chagrin, Yuu races ahead to customize Toshio's room the next afternoon with Posi and Nega's help not realizing that Toshio has stopped to read the magazine on the way home. Yuu races out to greet Toshio whose preoccupation with what he thinks is a love letter from Creamy Mami ignites a divergent concourse that prompts her to repudiate Toshio in disgust and run away in tears; after commiserating with the anguished Mami Shinoda at the park, Yuu sets course for a church that is a crucial component of her prologue with T
