An anime or manga series that is your guilty pleasure. You know that it's not all that good, but you still enjoy for various reasons. One of mine would be Medaka Box. I enjoy all the different quirks each character has. Even though a lot of the characters in the series had "fuck you I'm broken" powers, they were still pretty interesting. The ending was simple, yet satisfying. I'm still considering if I should get that Jump Star Victory game just to play as Medaka.