Despite advancing to a higher grade, Mina, his longtime childhood friend, ended up in the same class again—an annoying twist of fate. That day, sudden guerrilla rains left her completely drenched. Just as she resigned herself, muttering, "There's no way I won't catch a cold like this...", the tsundere Mina invited him over to her place. Outwardly pure and elegant, she hides a mischievous side. As she wrung water from her clothes, her skirt clung to her body, revealing glimpses of her bra and panties—each flash amplifying her irresistible sex appeal. Playfully teasing, "Don't look, idiot!" with a laugh, she unknowingly ignited an intense desire in him. Risking the destruction of their relationship, he took the plunge and made his move.