Rules / Hydra - Double Trouble (Doujinshi)

Yuki sees Hikaru with a woman, and is upset thinking that Hikaru might have cheated on him, especially now that they've been together for two years. To make things worse, the woman in question seems to be stalking Hikaru. Meanwhile, Atori and Tohru are concerned about their friends, but at the same time wonder how involved they should get.