Sasami-san@Ganbaranai - Season 1 Episode 2 : In-House Security Guard 2013

Sasami writes up a report explaining that the chocolate incident was the result of powerful gods appeasing to the wishes of Kamiomi, who unknowingly possesses the powers of the goddess Amaterasu. Meanwhile, many students are absent from school due to becoming engrossed in a fantasy social game. Intrigued by it, Kamiomi and the Yagami sisters borrow Sasami's spare computers to try it for themselves. Sasami, not wanting them to find something wrong with the game and shut it down, preventing her from playing it anymore, tries to interfere with their gaming to no avail and she inevitably reveals herself as a player while attempting to stop their tomfoolery. When a strange dark dragon suddenly appears, absorbing the spirits of all the players, everyone's minds end up getting sucked inside the game itself. The dragon is revealed to be something Sasami created three years ago when she once possessed the power of Amaterasu, which kept the game from being shut down.