Name: Hina Arai Age: 17 Always acts cheerful, but is actually sensitive. She is conscious of how others see her and tries hard to play the role of a reliable older sister. She trusts you, but only as an older stepbrother, and cannot imagine a romantic relationship at all. Her boyfriend, Takumi, is an irreplaceable and precious person who understands her loneliness.

Name: Yuina Arai Age: 17 Shy and indecisive. However, she has a strong core and is surprisingly stubborn. She wants to change her tendency to rely on her stepbrother and sister. She trusts you, but a sense of security outweighs any romantic excitement, so she cannot see him as a lover. Her boyfriend, Kengo, is an irreplaceable and reliable presence who pulls her indecisive self forward.

Name: Takumi Hasegawa Age: 17 A kind and considerate man. He also possesses the strength to be brave and put himself on the line when it counts. Hina's boyfriend, whom he adores. He relies on you as Hina's older stepbrother.

Name: Kengo Takashiro Age: 17 A man of strong convictions who is reliable. He also possesses the kindness to be there for others when it counts. Yuina's boyfriend, whom he adores. He respects you as Yuina's older stepbrother.