Joshi Ochi!: 2-kai kara Onna no Ko ga... Futte kita!?

Sousuke is a part timer living in an old, rusty apartment. It's not a bad place to live though, with a cute landlady Yuki who takes care of the place. Also, another cute girl Sunao living upstairs is great too. One day when Sousuke was bashing off, the ceiling came falling down with Sunao and she lands on his...
(Source: Coolmic, edited)