Eri

Age: 22
Birthday: March 18

Eri is Mayuri's cosplay partner. Eri attended the same Middle-School as Mayuri.

Eri is a sweet and considerate person, when she saw a young Ririsa at an adult event she gently asked her to leave after Mayuri confirmed that she was underage.

(Source: 2.5 Dimensional Seduction Wiki, edited)