BOKU NO PET NI NARINASAI

This girl's boss's hamster dies. She feels bad for him and agrees to pretend to be his hamster. She acts like a pet (really weird). They end up getting close. She notices he is alone, but thinks that he only likes her because she pretends to be his dead hamster so she ends the pet-master relationship. When I say "pet-master" it's literally she pretends to be a pet: eat out of a bowl, kneels, and keeps her master company but just sitting there. They end up having feelings for each other.

Happy ending?

It was just a big...?/? ??!?? ?!?

At least the art was good??