Tatoe Hai ni Nattemo

[**Series is cancelled due to author's death**](https://www.animenewsnetwork.com/news/2019-02-27/though-you-may-burn-to-ash-manga-kakashi-oniyazu-passes-away/.143962)

For his beloved younger sister's treatment, Shinomiya Ryouma is working frantically to raise a billion yen while going to high school. One day, a mysterious woman asks him, "Can you put your life on the line for what you desire?" and after receiving a ticket from her, an accident befalls him! When he wakes up, he finds he's turned into a girl and what's more, he's participating in a "game" where a win means he can reverse his fate but a loss means he'll die instantly!