D.N.Angel

D.N.Angel is a manga series that received an anime adaptation which aired in 2003.

The story follows Daisuke Niwa, an average middle school student who gets rejected by his crush on his fourteenth birthday. After then undergoing a sudden and strange mutation, he is informed by his mother that this phenomenon is the result of a genetic condition running in Daisuke's family that causes males to transform into the legendary phantom thief known as Dark Mousy whenever they think about their love interest. Daisuke is made to keep this revelation a secret, and is tasked by his mother to control Dark and steal valuable works of art for an unknown purpose, while learning that having his unrequited love returned is the only way to stop his transformations.

Episode 4
Satoshi is sitting on his bed when he gets a call from his father.

Episode 14
Daisuke and his classmates are at the school pool.

Episode 15
Daisuke walks around sleepingly in his home.

Episode 17
Daisuke and his classmates visit the beach as part of an island excursion.

Episode 19
Dark appears shirtless and restrained.

Episode 26
Satoshi's shirt is completely torn off, leading Daisuke to give him his coat to wear.