Chigusa Senrou

Man of the alternate world with an immortal body. He suffers from amnesia, only remembering his name, his world, and his goal to wipe out all the Ayame. He needs the power of the Sanome for his battle. He attaches himself to Rakan when he learns that he is a Sanome, vowing to protect him at all costs. He often displays his liking for Rakan by hugging him or picking him up, causing him to be labeled a pervert.

(Source: Wikipedia)