Infinity/Zero
mahou shoujo · mystery

7 years ago, twins Kurohane Hotaru and Mitsuka become Nexus Knights to protect their small town, sticking together even in battle.

7 months ago, after ages of tracking down a high-powered monster, Hotaru decides to go after it on their own. They don't return.

7 days ago, a fellow Knight shows up on Mitsuka's doorstep, absolutely certain she can help track a new villain down.

"What makes you so sure you need my help?"

"Because I'm certain you know their true identity. Are you familiar with a Kurohane Hotaru?"