Nejire-Usagi, mascot of the Rabbit Shed Shop café and often called "NejiUsa," is a rabbit doll animated by the power of memoria. This force grants him sentience, mobility, and speech, marked physically by a prominent screw embedded in his head.

As part of the Rabbit Shed Shop team, Nejire-Usagi joins missions to defend otaku culture against a mysterious virus that erases memories and corrupts fictional worlds. He travels alongside the café's heroines into these infected worlds to combat the virus and restore the original narratives. During an early mission within "Welcome to the Rabbit Café," he witnessed the virus transforming rabbit elements into eels. He supported the team confronting the antagonist Maya, aiding in neutralizing the mother virus to repair that world.

Nejire-Usagi continues his support in later missions, including journeys into worlds like "The Rosy Maidens" and "Mini Basket!," assisting the team as they eliminate viral threats and preserve the stories. His consistent role is as a supportive figure within the group, contributing to their goal of reclaiming lost otaku memories and revitalizing Akihabara's cultural landscape.