Devils' Crest

Ninth grader Yotsuya Yuusuke is practical, friendless, and not active in any clubs. Then one day, he and two female classmates are suddenly sent to another world where they must work together to battle for their lives. Yotsuya is a lone wolf and has always lived his life according to his wants, but how will that work out now that he’s supposed to be a hero?!

With his two friends, a video-game-obsessed young man finds himself in a strange version of Tokyo where they must compete in dangerous games to win.

One day, a gamer played video games until he fell asleep...and when he woke up, he found himself in the game world—as a skeleton! Equipped with the powerful weapons and armor of his avatar but stuck with its frightening skeletal appearance, Arc has to find a place for himself in this new, fantastical land. All his hopes for a quiet life are dashed when he crosses paths with a beautiful elven warrior, setting him on a journey full of conflict and adventure.

Sakamoto, an unemployed young man, is one of the world's top players of an online fighting game called Btooom! One day, he wakes up on what appears to be a tropical island, although he doesn't remember how or why he got there.