"Stop. I don't want to grow up. Those happier days...those days when we would never separate....those days where I can still smile...return them back, all of it..."

A childhood friend of Kokoro. She also appears to be an idol from a group known as Persephone≒Perilune. While Reika is often perceived as someone talented and mature--the true Reika is someone that nobody would have expected, yet, to Reika herself, is far from a secret she kept to anyone...

Personality

Nicknamed the "shining, smileless idol"--As Reika is often admired for her beauty and seemingly "mature" appearance for her age, many didn't know that all of those are almost a facade that hides her lazy and childish self. Knowing that her true intention and efforts in anything often lead to anything but fruitless outcomes--this leads to Reika often doing most things half-heartedly, and her position as a rising idol is no exception to this. One known characteristic of Reika is that she's often envious of others who she considered to be "better" than her in a lot of aspects, be it from pure luck or skills. Fitting for her age, she does have many small and selfish desires--with one of them being her wish for people to finally notice her "true" self which is far from every common expectation of her.

It is strongly implied that Reika owns a fear of growing up, and this is part of the reason why she refuses to accept her mature-like demeanor and appearance. Deep inside, Reika still believes that she's a normal 6th-grader and felt like she's slowly throwing away all her childhood as she grew older and got more pressured into who she is now. She also hardly ever trusts or open up to anyone (aside from Kokoro), as she often claims that people only admired her for her appearance, not for who she actually is.