Kou Mukami/Anime

Episode 13
Kou appears on top of a nearby cliff with his brothers after the Sakamaki's limousine crashes. When Yui takes a stroll in the rose garden outside the Sakamaki mansion, Kou is the first to greet her. He sneaks up behind Yui and whispers into her ear, 'Found you~!' which startles her. He then picks up the rose petal Yui dropped and greets her with a good morning instead of introducing himself. Yui backs away and tries to run from him, but his brothers, Yuma and Azusa appear and block her paths. As Yui flees from them, he watches on and appears again when Ruki captures Yui at the end of the episode, but his hand is only seen closing in on her along with Yuma and Azusa's.

Episode 14
Kou is present when Yui awakens. He comes down the stairs leading to the living room after Yuma yells at Yui to not make a big fuss about her abduction. Kou tells Yuma that it is alright, saying that it's natural for Yui to react like that since they had abducted her so suddenly. When Azusa scares Yui by asking her whether she likes pain, Kou tells him that he shouldn't ask inappropriate questions to a person they had just met. When Yui refuses to trust them, he gets irritated and tells Yui that they don't care whether she believes them or not.

Episode 18
Kou is with his brothers as they accompany Yui when Ruki finally allows her to attend school. He is later seen again being surrounded by a group of girls, and he doesn't seem to notice Subaru confronting Yui and dragging her away. However, he later follows the pair to the school roof where he interrupts Subaru's confrontation with Yui about her reasons for "leaving" the Sakamaki's. He also appears amused to see her struggling to explain her situation to Subaru. Kou provokes Subaru and he uses his right eye on him to find out Subaru's feelings towards Yui. He then challenges him to take Yui back if he really wants her when he suddenly embraces her from behind. This further provokes Subaru, prompting him to grab Yui and bite her, much to Kou's amusement. After Subaru leaves, Kou bites her in the same area in order to make her forget that Subaru bit her earlier on. As Yui's consciousness begins drifting away, he vows that he will not hand her over to the Sakamaki's.