D-Frag! Vol. 7 (manga)
When the Game Development Club decides to go to the mysterious "Famous Athlete Hashimoto's Adventure Island," Kenji knows it's not going to be a normal field trip. Once on the island, they meet up with game clubs from other schools for a tournament, but before it begins, four masked villains kidnap the master of ceremonies! Can Kenji and his clubmates rescue Famous Athlete Hashimoto and still squeeze in a leisurely visit to the beach?