Iroha Tamaki was trying to get away from the Magius headquarters until Nemu Hiiragi one of the leaders stepped in front of Iroha however Nemu was shorter but she was a bit stronger than Iroha despite the height and age difference.

“Big sis I can’t let you escape..”

Nemu says before she snaps her fingers and traps Iroha inside a magical barrier and then puts her into a room and keeps Iroha trapped inside of the barrier.

“I wouldn’t have had to do that if you would’ve just joined Magius in the first place big sis..”

Iroha was a big sister to Nemu and her friend Touka but Nemu was a friend of Iroha’s younger sister Ui and bonded with Iroha as Iroha was her only connection to the outside since Nemu used to be in a hospital.