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Makoto is staying at her older brother's house to study for entrance exams. However, the older brother and his wife have a cold attitude. During her husband's business trip, Makoto witnesses a forbidden love affair between her sister-in-law Itsuki and a delivery man. Makoto, who has taken advantage of Itsuki's weakness, invites a friend from cram school to a house where his brother is not. I will sleep in a sleeping tree at night. Makoto and the others gradually escalate. At first, Itsuki resists, but...