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Koichi comes to visit his classmate Yosuke's house, and when he finds out that Yosuke's mother, Shuri, is masturbating while taking a bath, he gets so excited that he begins to squirm on the spot. When Akari notices that, she gently licks Koichi, who is shy, and proposes a rainy day relationship, saying, "Let's feel good together." Koichi refuses because he fears that his relationship with his best friend will worsen, but he reluctantly accepts Akari's forcible proposal that her husband wants to get rid of his frustration after a business trip. ..