Iroha Tamaki was trapped in some sort of world with just her in it until someone appeared in front of her in a wheelchair and it was Nemu Hiiragi, who was friends with Iroha’s younger sister Ui who was also the same age being 11 making them younger than Iroha was 15.

“Hello big sis it’s seems you’ve awoken..”

Nemu then gets out of her wheelchair and stares at Iroha, Nemu was a magical girl like Iroha but she was one of the leaders of Magius a magical girl group and there was another leader who was also a friend with Ui named Touka Satomi who was the same age as Nemu and Ui.

“I had to trap you here in this rumor I made so you wouldn’t interfere with our plans but don’t worry this is being done for you..”

A chair then randomly appeared and Iroha sits down in the chair.