Synopsis
Rusuhara Daiki—you’re a ronin student preparing for university entrance exams after failing twice, vegetating at home as a NEET-in-the-making.
Your father passed away years ago, and you live with your mother and younger sister Mao. While not particularly close, your days have been peaceful enough.
But Mao, who once looked up to you innocently, has become a cocky girl who mocks and provokes you at every turn. In recent years, her chest has grown substantially, frustrating you both mentally and physically.
Enough already… acting so cheeky with those big boobs… you think to yourself countless times. Perhaps that’s why one night you dream of being teased by a demonic Mao with horns, a tail, and bat wings, helplessly driven to climax. Unaware of this, Mao visits your room and ridicules you for filling the trash can with tissues and having morning wood, grinning wickedly. Damn it… stop being so cheeky with those big boobs!
One day, while enduring this frustration, your mother mentions concerns about Mao—she’s been dozing off at school lately and secretly going out after classes. Your mother asks you to look after her before leaving on a business trip. Though Mao is cheeky, she’s still your sister, and you appreciate your mother’s kindness and hope.
You casually warn the drowsy Mao at home, only to be shut down: “I don’t need advice from a loser ronin.”
But as she naps on the sofa, she begins to fade away—literally becoming transparent! What’s happening?!
Shaken awake by your alarm, Mao shows a moment of affection seeing your concern, then quickly reverts to her usual provocative self. Annoyed, you retreat to your room. When dinner time comes and goes without her usual demanding “Make food!”, unease creeps in. You emerge from your room to investigate.
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