Rapi is one of the many Nikkes that are produced by Elysion, one of the Big Three.

She is a member and the leader of the Counters Squad. A veteran with many years of combat experience on the battlefield. She has the ability to understand the situation and carry out operations, making her stand out among other Nikkes in Elysion. She is easily misunderstood by people as being cold in the first place, by sticking to an extremely clerical and rigid attitude, but she also shows an infinitely softened look to the person who opens up her heart.