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Waiting in your own apartment, the one who greets you is your older boyfriend, Ritsu Sena, with a teasing smile on his lips. Shaken up by his mischievous words, you're pulled into his possessive embrace--.

Seigo Tachibana, the older boyfriend you live with, has gotten his hands on a "Shared Notebook" where any rule written inside becomes absolute law. Sweetly cornered by his larger frame with nowhere to run, a sinful life of cohabitation begins—leaving you to be toyed with every night by outlandish, humiliating house rules.