Introducing Kou and Online Gaming Revenge.Naoya meets a customer at his part-time job, whose silhouette while playing games reminds him of his brother. The following day, he bumps into the same person again at his university cafeteria, and introduces himself. He realises that the person, Sakuragi Kou, is an avid gamer like his brother, but doesn't realise that she is a girl due to her androgynous appearance and voice...