Yuurei-san to Furyou A

Azuse Nagi transfers to the infamous Fukura High School, known for its bad reputation. There, in an unused student guidance room, he meets a ghostly boy who introduces himself as "Yuurei-san." No matter how much he ignores him, the persistent ghost keeps asking, "Let's play together". Reluctantly, Azuse agrees to a game: if he wins, the ghost will leave, but if he loses, he'll have to follow one of his requests. What starts as a trivial bet begins to significantly change Azuse's school life. This is the beginning of a school fantasy that depicts the thrilling friendship between a ghost and a delinquent!

(Source: MangaDex)