Overview: The protagonist,Kotaro,and the heroine,Rina,have been lovers since they entered the school. They also get along well with their best friend,Hajime,who is in the same class as them,and his girlfriend,Mayu,and the four of them often hang out together. After the exams,the four of them go out to play in the city,and on the way back,they stop by Hajime's house for a pleasant chat. That was a normal thing to do,but perhaps because they felt a sense of freedom after the exams,the erotic talk that started as a joke takes an unexpected turn. "Aren't you curious about what other people do?" That one word is what starts them showing each other sex. A side of their friends that they normally wouldn't be able to see,even though they hang out together. Their own secret acts that they've revealed. A mixture of emotions such as shame,jealousy,and a sense of guilt,and the excitement they feel for the first time... The four of them get addicted to it,and their actions gradually escalate...
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