Also known as: 大沢瑠璃乃の段ボール箱
A pink and white Cardboard Box owned by Osawa Rurino from Love Live! Hasu No Sora Jogakuin School Idol Club. It was given to her by her fellow clubmates as a way to recharge her social battery, much to her dismay. Then she started using it anyway.
It has since been extensively decorated with Stickers and Drawing (Object)s.