Akashigata Tsubaki

Akashigata Tsubaki (明石潟椿) is biologically Somei Yoshino's cousin and another of Renji's granddaughters from one of his mistresses. Yoshino also mentions that her and Tsubaki's mothers are half-siblings.

She also reveals that Yoshino did not actually sell her kidney to Kirishima, but lost 1,500 millilitres of blood for 4 million yen, and she is the one who purchased it and refused to give him.

Appearance
Tsubaki has a long and black 'hime' haircut, big pupils but narrow eyes. She also seems to be in the same height as her cousin.

Personality
Tsubaki has shown a great affection to her grandfather Renji since she was very young and admires him as a perfect being of an idol. Because of this, she likes to see Yoshino's face, since Yoshino resembles a lot like him.

Tsubaki also has mysterious thoughts about Miyama Kirishima and wonders of what he is actually thinking. She also reads people's minds easily and can see their personalities almost immediately, such as Kirishima's mind. She can also be very horrifying as a person, since she scared Kirishima that she could change herself to look like Yoshino so that he can never find her. It is also noted that Tsubaki helped Yoshino a lot, to where Yoshino can completely trust her.

It is later revealed that outside of only Renji, Tsubaki technically hates and has a distaste for Osaka men, which includes Shouma; who also hates her due to her being a Kyoto woman.

Somei Yoshino
Yoshino and Tsubaki are generally cousins who shares the same grandfather, and Tsubaki stated that she really likes how much resemblance Yoshino has with their grandfather, Renji. Tsubaki and Yoshino have a solid good friendship and the two can leave their trust on each other really well, treating each other like best friends. Like Shouma, she doesn't like how she is paired with someone like Kirishima. Tsubaki would also protect Yoshino in all costs and looks out for danger for her cousin.

Somei Renji
Renji is both Yoshino and Tsubaki's grandfather. However, Tsubaki sees him more as an idol to admire and generally looks up to him. At one point, Tsubaki lied to Renji that she likes spinach although in reality it was the total opposite. Yoshino stated that she would literally do anything to meet him or spend time with him, like one time he returned from a trip to England only to see Tsubaki trying to get to him as soon as he got off the plane.

Miyama Kirishima
At first, she sees Kirishima as Yoshino's boyfriend, and stated how sweet they look. Eventually, when Yoshino is away, Tsubaki released her true thoughts about Kirishima. She also bluntly told him that his mind is easy for her to read, and told him that she bought Yoshino's 1,500 millilitres of blood for 4 million yen, and refused to give him the actual product. Tsubaki eventually told him that she could even went for plastic surgery to look like Yoshino, so that Kirishima does not get to find her again. However, they both asked for contacts, and Kirishima will send her pictures of Renji in order to receive pictures of Yoshino. However, this doesn't erase the fact that Tsubaki technically looks down on him in general, and thinks of him as immature and childish. She can see through him easily, and this shocks Kirishima, considering that she is more mind-reading than he thinks.

Toriashi Shouma
The two despise and hated each other and usually insults one another upon interaction. This is due to Shouma's distaste of Kyoto women, and Tsubaki's hatred of Osaka men except Renji.