CHAOS

Ryoka Tachibana, the eldest sibling in the Tachibana family. At a young age, she was abandoned by her parents, left in the streets to die alone at the age of only four. She is found by Masato and Ryoko Tachibana, taking her in and raising her as their own.

Ryoka's personality is more calm and quiet, she loves to read and doesn't really like to talk to people that much. Ryoka (16), two years older than Hinata, (14), and three years older than Naoto, (13), but they're much closer than their ages, always doing things together as they grew up. Ryoka loves her family and wouldn't change it for the world.

Basically, when Hina starts dating Takemichi, she tries to get Ryoka to go out with them more often in hopes of finding love herself. How will this end up for the Tachibana siblings?