Falling into the Back Room? It's Okay, I Have an Invincible Robot

There Is No Masterpiece in the Back Room. If You Don't Accept It, Come and Argue!

A Book That Travels Through Time and Becomes an Entity

There are too few bookshelves. Can anyone get some for me?

Have You Ever Come to the Back Room and Become a Spoilsport?

I want to see a story with strong logic, a calm protagonist, and someone who can always come up with a way to deal with danger.

Has There Been Only Partygoers at First, and Then the Protagonist Wakes up and Becomes the First to Sweep?

I want to read a book like "I Became a Subspecies Spoiler".