Collar Of Doom

Aizawa Shota and Hizashi Yamada has been living together, and been dating for quite a while, and it's no secret. But one day, Hizashi goes missing, and comes back randomly one day, with a strange collar around his neck, which nobody knows what it is, but one person does know. Aizawa Shota, and he's going to do everything in his power to save Hizashi Yamada.