If you are looking to create content around her, here are a few popular angles used in the community: "Healing" Edits

In Japanese media, younger sisters are rarely just background relatives. They generally fall into distinct sub-archetypes:

Yahiko is the closest the series gets to a biological "little brother" for Kaoru. Their relationship is a classic portrayal of sibling rivalry and deep-seated affection:

Unlike many rom-coms, the characters communicate openly and resolve misunderstandings quickly.