This is a set of 14 books by Yusuke Yamada. I've read each of them once or twice, but there are no noticeable scratches or stains. ・Party ・When You Push the Switch ・Kirin ・The 93rd You ・Nihon Bunretsu (Japan Split) ・Goodbye Until Then ・The Nameless Dead ・Until I Erase My Memory ・Batsu Game (Punishment Game) ・Thumb Search ・Avatar ・Monitor Room ・Puzzle ・It Always Rains When You're Here Instant purchase is okay.