以一棟破爛公寓作為主題，描述某一日住在公寓二樓的房客丹生砂生在一場意外下，就這樣從二樓地板的破洞摔到主角相川壯介的房間？！
Character Design
Director, Script (eps 1-9), Storyboard (ep 1), Episode Director (ep 1), Series Composition
Theme Song Performance
Animation Director (eps 4, 8)
Key Animation (ep 2)
ADR Director (Latin America Spanish dub)
Sound Director
Original Creator
Key Animation (ep 2, 5)
Sound Effects
2018年 季度排名 #1
2018年 動畫總排名 #31