20年間彼女なし、大学の研究室でもぼっちだった僕。そんな僕に声をかけてくれたのが天宮先輩。女性に免疫のない僕は、先輩に優しくされてすぐさま好きになってしまった。でも先輩には彼氏がいて、僕はただただ目で追う事しかできなくて…。そんな中、僕に転機が訪れた。就活を終えた先輩に飲みに誘われ、僕たちはその夜関係を持った。一度きりの関係だと思ったけれど先輩は「セフレならいいよ」と言い、僕たちはその日からセフレになった。

I'd been single for 20 years and was a loner even in my university research lab. It was Amamiya-senpai who reached out to me. I had no experience with women, and I immediately fell for her when she was kind to me. But she had a boyfriend, and all I could do was watch her from afar… Then a turning point came for me. After she finished her job hunting, she invited me out for drinks, and we ended up sleeping together that night. I thought it would be a one-time thing, but she said, "It's okay if we're just friends with benefits," and from that day on, we became friends with benefits.