Monster Musume: Everyday Life with Monster Girls

Monster Musume: Everyday Life with Monster Girls is a manga series that received an anime adaptation in 2015.

The series is set in a world where mythical creatures are real and the Japanese government has passed the "Interspecies Cultural Exchange Act", allowing them to become part of society but with certain restrictions such as not being able to cause harm to or procreate with humans. One day, Kimihito Kurusu finds himself inducted as a "volunteer" in the government exchange program and a lamia named Miia comes to live with him. As time passes, Kimihito meets and provides a home to many women, each of a different species and vying for his attention.

OP
Kimihito finds himself shirtless thrice.

Episode 1
Miia takes off Kimihito's shirt.

Episode 2
Kimihito's chest is wrapped in bandages after taking a blow meant for Centorea.

Episode 3
Miia pulls up Kimihito's shirt.

Episode 4
Kimihito takes a bath.

Episode 8
Suu helps Kimihito after he comes down with a bad cold.

Episode 10
Centorea pulls up Kimihito's shirt.

OVA 1
Kimihito and the girls are sent to a gym, leading to a race in the pool with Kimihito as the grand prize.