Keikou Mayoi (軽光真宵) is a member of the Seiran Fellowship. She is voiced by Omori Nichika (大森日雅).
Profile
Mayoi comes from one of Japan’s top ten corporate families, and her magic matches her bank balance: she uses jewel magic that consumes — literally evaporates — expensive gemstones.
She wears braces and is not remotely self-conscious about them. Her manners can be rough and she gets overly familiar with people quickly, but she knows where the line is. When a situation calls for it, she can switch to a surprisingly polite and considerate side.
In combat
Mayoi carried the Breaker role label in the October 2026 CBT. Gematsu’s coverage of the September 2026 release-window announcement also singled her out as the Seiran Fellowship’s gem-powered magician. See combat roles and the Break mechanic.
Relationships
- Mitsukoe Runa — fellow heiress and clanmate.
- Shiranui Ren — friend and errand-runner, secretly a bodyguard dispatched in part by the Keikou family.
About the Breaker role
Likely built to drain enemy Break gauges, which opens the window for big damage. (Our reading of the CBT label — official definitions are pending.) Other Breakers in the CBT: Tanaka Erin, Hanamori Moa, Natsume Souka, Nowatari Shion.