His Childhood Friend is a Beautiful, Reclusive Girl, So He Spends His After-School Hours in Her Room (But He’s Not Her Boyfriend!), Osananajimi ga Hikikomori Bishoujo nano de, Houkago wa Kanojo no Heya de Sugoshiteiru (ga, Koibito dewa Nai!) 幼馴染が引きこもり美少女なので、放課後は彼女の部屋で過ごしている（が、恋人ではない！）novel:
This flirting is more than lovers! After-school love comedy with a childhood friend who wants to spoil you! I, Mikami Souta, a high school student, have a childhood friend. The beautiful high school girl, Kisaragi Yuika. However, she’s lazy, spoiled, and a hardcore recluse. I visit Yuika’s room after school to keep up with her lazy life… As a thank you for the billing card, she hugged me, we watched anime closely next to each other, and even slept together once in a while! But we’re not lovers. “You can’t fall in love with me, okay?” It’s a precautionary measure to protect our current lifestyle so that we can remain “childhood friends.” But then… why the heck are you approaching me with a kissing face!? An after-school lovey-dovey comedy about childhood friends who are more than just lovers!