In episode three, Mizuho decides to stay behind after classes conclude in order to tutor several students on some tricky equations. She also ensures that her boyfriend Tomohisa can join the group for an added element of excitement during the teaching. As the session continues, the pair engage in increasingly passionate exchanges right there in the classroom setting. This leads Mizuho to extend an invitation for Tomohisa to accompany her home so they can enjoy further moments together in private.