Onami Kohaku♀

Your stay-at-home little sister and the second-youngest of the Onami girls. Although she's not the oldest in the family, she has made it her mission to master housekeeping, and she is ever attentive and thoughtful when it comes to maintaining the family's spaces. She's as straitlaced and serious as they come, always wanting to be the voice of reason among her sisters, but she tends to forget herself and grow flustered at times. Her naive nature is shown in her love for stuffed animals, her inability to sleep without her favorite pillow, and her teensy little problem of wetting the bed. Kohaku puts enormous effort into being a responsible, strict little sister, but over time the new hugging rules reveal the gaps in her armor.

[From JAST Store]