Tsukasa, a university student with no romantic experience, finds his room invaded by his younger sister and her yankee friends. When Tsukasa discovers Erika, the stunning beauty among the group, asleep in his bed due to period fatigue, he decides to educate her in manners and common sense. As Erika openly expresses her love for him, Tsukasa is captivated by her boldness and dedication to learning. This sparks an unconventional romance between a yankee high schooler and a nurturing university student.
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