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Today is the day of an important baseball game for my only son, Takayuki. Yumi sent her husband and Takayuki away and decided to leave alone. That "important business" is a secret meeting with Sefure Shinichi. Moreover, he chose Yumi's house because he didn't want to waste even a single second of his time. Then the chime of the house rings and Shinichi comes. The two people's "time limit, unlimited FUCK" starts from this moment...