Onnanoko ga Ochita Saki wa, Ore no Musuko no Sakippo

is a Japanese digital manga written by Hatokonro, serialized by ComicFesta on June 2016. An short-anime adaptation entitled aired from July 2 to August 27, 2018, with the uncut version aired on AT-X.

Plot
Sousuke Aizawa lives in a rundown apartment building where his only consolation is that the beatiful landlord is a beautiful woman named Yuki Shimizu and the cute upstairs neighbor girl named Sunao Unyuu. One day though, the ceiling above him creaks and... Bang! The cute girl from the second floor comes crashing down on him…!?

In an erotic encounter that can only be classified as a miracle, hearts and bodies are connected by chance. Then for some reason, he starts to live with both of these beautiful women!? Under this one roof, just what exactly will become of this crowded love triangle...!?