I Never Shot Anyone (2020)

Ichikawa pretends to be a legendary hitman. But the truth is, he's a pensioner trying to become a hard-boiled crime writer. He accepts hit jobs and passes them on to a real professional only so that he can write about them in detail. It's all fun and games for the old man until his wife starts to suspect him of having an affair, and his hitman alter ego ends up on an actual hit list.