Masamune-kun's Revenge

Masamune suddenly gets a call from Aki on his cellphone. Masamune then realizes that the picture of him and Aki when they were children that was in his room is gone, and he’s certain that Neko is the one who took it. Masamune sneaks into Neko’s room to try to find out the truth, but is found by Neko. And then, Neko does something rather surprising...