Seigo is the older brother of the well-liked honor student, Yuua. As puberty takes its course, Seigo attempts to create some space between himself and his adorable younger sibling. However, Yuua's innocent physical affection proves too much for him to resist. Over time, Seigo becomes overwhelmed by his desire and gives in to his lust. As soon as Yuua reciprocates, his longing to be close to his older brother intensifies with each passing day. This story is recounted in "Teirui Makura" as a compilation of love ballads that explore taboo love.
