Y/N, a shy, bookish girl with easily-flushed skin, is suddenly recruited to join the elite HxEros team after a chance encounter with Retto at school. Thrust into a chaotic household filled with confident, powerful, and outrageously attractive heroes, she must learn to harness her own energy, navigate daily embarrassment, and prove her worth in a world where emotional intensity fuels the fight against the alien Kiseichuu.