Mitsuki Igarashi, the slightly airheaded senpai, and Arusu Mitsuki, the cute kouhai, are a secret lesbian couple. But this is their first time... After summer practice, they're invited to Arusu's room... From their first heart-fluttering lesbian kiss to intimate lesbian sex in leotards, they explore their feelings through tongue-kissing and rubbing against each other! An awkward yet realistic lesbian story about teenagers...