Supernatural bands [ereri/riren]
Eren is an omega wolf. He also happens to be the lead singer of the punk band '104th'. His mother is dead, his father is absent and his sister is the bass-player in the band.
Levi is a vampire. He is the lead guitarist and singer of the other punk band, 'survey corps'. He doesn't have family. Only his two best friends. Hanji and Erwin.
Petra arranges a tour for Levi's band, with the help of Armin. Armin is the manager and best friend of eren. The two bands tour together. 104th open concerts for survey corps. And survey corps open for 104th.
The only thing is, only one tour his is available. Meaning, the two bands share a bus together. Romance blossoms between the bands.