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Yukio, a young office worker, is molested daily on his train commute by a high school boy. One day, his father tells him they will be moving in with his lover and he finds out that the train molester will now be his little brother!
Kazuomi is an omega who loves baseball and all he wants is some peace. Sucks for him though because he's too busy being f*** like a sandwich by two alphas.
Yukio Tanikawa always wanted a cute younger brother as an only child to a single father. But never did he think his wish could come true. Suddenly, Yukio is going to be a big bro?! What a surprise! What a gift! What a... complete NIGHTMARE! When he dreamt of having a brother, being groped and defiled was not a part of the plan. Now, not only does Yukio have to accept his father's secret lover as his new dad, he must accept his perverted son Masumi as his new brother! All under the same roof!