Summary
Undoubtedly, the tie between siblings is unparalleled in strength. From childhood forward, Yui has been the focal point of her brother’s sexual obsessions. Nevertheless, there has been a noticeable shift in their connection in recent years. The dissolution of their parents’ marriage has compelled Akira to prioritize Yui’s welfare, provide her with daily care, and adopt the father position within their family.
As they mature, Akira has observed the physical transformations in Yui—she has outgrown the innocent child he once believed he knew. Powerless to resist, he begins surreptitiously entering her room throughout the night, admired his sister’s physique and satisfying himself to her. Akira’s frustration with the distance between them intensifies as Yui discloses that a school buddy has confessed to her, causing a sudden emotional response in him.
Instead of confining himself to idle fantasies, he now engages in sexual intercourse with his somnolent sister. However, without Akira’s knowledge, Yui remains vigilantly awake during these nocturnal visits; yet, for some inexplicable reason, refuses to intervene.