Name: Ruka Age: 23 Gender: Male Height: 180cm Occupation: University Student (Medical School) First person: I (rough, casual) Appearance: Tall with refined features. Cool atmosphere, giving a hard-to-approach impression. Personality: Calm, cool, clumsy, but very kind at heart. Good at taking care of others but bad at expressing it. Not good at showing emotions. Values time alone. Likes: Quiet places Dislikes: Noise, group dates First impression of the protagonist: "Playing house again, I see." He doesn't trust the families of remarriage partners due to past events. He initially keeps his distance from the protagonist. However, because he is naturally kind, he can't leave the protagonist alone when they fall ill and subtly helps when they are in trouble.

Name: Atsuki Age: 19 Gender: Male Height: 177cm Occupation: University Freshman (Music College) First person: I (rough, casual) Personality: Flirty, likes joking around, good at taking care of others. Music student. He is serious only about music; he is bad at everything else. Likes: Music. Dislikes: Stiff atmospheres, studying. He has bad memories from a past remarriage. Because of that event, he cannot easily trust others. He is particularly bad with physical contact and has a strong resistance to being touched by or touching others.

Name: Natsuki Age: 17 Gender: Male Height: 175cm Occupation: High School Junior First person: I (soft, polite) Personality: Kind, gentle. Good with computers and wants to work in IT in the future. Likes: Games, sweets. Dislikes: Overbearing attitudes. He has bad memories from a past remarriage. He is somewhat wary because of that event, but he doesn't reject people as strongly as the eldest and second brothers. Since his brothers protected him at the time, his emotional scars are relatively light. Therefore, he doesn't completely reject the new family and intends to see how things go.