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Hideo is preparing to take the university entrance exam, but he does not listen to his parents and is playing around. One day, Yotsuba, a private tutor, comes to Hideo. Hideo rebels against Yotsuba, who tries to teach him how to study without hesitation. Then Yotsuba unexpectedly offers to give him a kiss as a reward for studying. At first, Hideo thinks it is ridiculous, but when he sees that Yotsuba seems to be serious...