Yuya is excited to learn that Nanami, who has been the "big sister" he admired since childhood, is coming to his house for the first time in a long while. At first, he is too nervous to speak properly, but as they spend time alone together, they gradually open up to each other... With the help of alcohol, they share a kiss. Yuya cannot suppress his arousal at the first adult kiss he has ever experienced, but Nanami also finds herself unable to suppress the aching in her body. Then, in the middle of the night, Nanami visits Yuya's room...
