Daiya is a university student who wishes to have a girlfriend. He spends his days studying and playing around. He usually goes to Ohashi's apartment after a long night out. Living alone, he doesn't have to worry about anything, and his location is also convenient. Moreover, Ohashi is always willing to take care of Daiya! One night, however, a shocking incident occurs... This warm and fuzzy feeling between his legs- it was Ohashi's mouth, sucking on Daiya's private parts!? ミステリアスな寡黙男子×寝たふりをするノンケ。一人暮らしで街中に暮らす同級生。宿がわりに使っていたはずが、気が付くとなんだか気持ちが良いことに！？「絶対にオカシイのに、やめたくない。」 彼女が欲しい大学生の大弥（だいや）。勉強もそこそこに遊んでばかりの日々。いつも夜遊びの後には決まって大橋（おおはし）の家へと泊まりにいく。一人暮らしで気も遣わなくていいし、立地が便利。しかも大橋は何かと甲斐甲斐しく面倒を見てくれる。ついつい甘えてしまう大弥だったが、ある夜、衝撃的な事件が起きる。股間に感じる生温かい感触、それは…大弥の性器を含む大橋の口だった。