"YuiNa" and her husband visited their mutual friend Naoki's house to comfort him, as he had recently gotten a divorce. While the three of them were happily drinking, "YuiNa's" husband, who was not good with alcohol, fell asleep. Actually, Naoki and "Yuuna" were ex-lovers from their college days. As they drank together, they reverted to their past selves, and "YuiNa," who was easily swayed, crossed a forbidden boundary with Naoki. Upon learning of this relationship, her husband could no longer restrain himself and faced a shocking end.
