The Erotica Author's Favorite

Homeroom teacher Chiaki Himeno has had enough of his students bringing raunchy novels to school. One of them insists that his uncle, renowned writer Seishu Kuga, has been paying him to review these novels - but why does a mystery writer need insight into erotica? Himeno's going to get to the bottom of things, even if he has to talk to the writer himself!