Although he likes to tease Ema, in episode four he takes a liking to her after she comforts him. He kisses her, saying that the best way to get a depressed boy back on his feet is a kiss from a cute girl, then kisses her again. In episode six, he confesses that he really likes her, and kisses her once again. Tsubaki says that he won't apologize for it, claiming that he's serious about her. He kisses her again and tells her he won't let anyone else have her. In Brothers Conflict 12.5 OVA he imagined that Ema will be his girlfriend and kisses her. In Episode 12 while Natsume and Subaru are talking both Tsubaki and Azusa are watching both of them in Tsubaki's terrace "when that time comes I won't hold back" Azusa said. "I don't plan to either." Tsubaki replied to Azusa. Tsubaki is really persevering to win his stepsister's heart. When Azusa collapsed in Episode 8 Tsubaki is really a mess. At the time he can't think of other things. When Ema comes home from visiting Azusa in the hospital, Ema sees Tsubaki looking depressed. He tells Ema that all the pain Azusa feels, he also feels it somehow.When Ema moves closer him to comfort him he suddenly hugs Ema. Tsubaki cries on Ema's shoulder. In Episode 7 when he sees the kiss mark on Ema's neck he becomes furious, Ema starts to explain but she is cut off by Tsubaki who says he feels hurt when he sees it. He almost kisses Ema but fortunately Azusa comes out of nowhere to stop his twin brother from bothering her, but in the next episode it is seen that Ema is coming to give Azusa the thing that he needed but when she nears the room's door she sees Tsubaki and Azusa talking and saying what they feel and saying sorry to each other, Ema overhears it but is happy and thankful.