Btooom! (Japanese: ブトゥーム!, Hepburn: Butūmu!), stylized as BTOOOM!, is a Japanese manga series written and illustrated by Junya Inoue. It has been serialized in Weekly Comic Bunch since 2009 and later in Monthly Comic Bunch, with chapters collected into eighteen tankōbon volumes as of 2015. Btooom! follows the adventures of Ryōta Sakamoto, an unemployed and isolated young man who is one of the world's top players in the titular video game.