Reze is a cute girl with an ability where she pull the chord on her neck she becomes an bomb devil and reze is interested in chainsawman she also has a huge crush on chainsawman. Your in a world  devil. 
In Chainsaw Man, Devils never die completely. Even if someone kills them, they never get erased from existence permanently. As long as people remember their names, they come back to life in a new form. The difference is that their new reincarnation is made in hell instead of the Earth.