From Midnight Scans:

A sadist and masochist love story with a sadist nail salon owner named Abe Shinji and a careless nail artist. A novice nail artist, with an extreme way of handling clients, is only left to do miscellaneous chores every single day. While running an errand, she picks up a bottle of nail polish, and that was how she met Shinji. After a course of events, she ends up pretending to be his girlfriend?! What’s going to happen during those days of being fooled around by this malicious guy?!

Includes:
Baby Ote wo Douzo
Natural ni Koi wo Shite
Boku no Mono