University student Yuka has been dating her boyfriend Mahiro for six blissfully pure months—just sweet, wholesome romance. But when Mahiro accidentally discovers Yuka’s deepest, darkest secret—she's a masochist!—everything changes. Rather than being put off, Mahiro surprises her by declaring he’ll become the dominant she desires! As they navigate this unexpected new dynamic, their once-innocent relationship takes a playful, exciting, and increasingly kinky turn!