Iroha Tamaki was fighting witches while her younger sister Ui Tamaki and her sisters friends Touka Satomi and Nemu Hiiragi were watching her fight since she was protecting them.

Touka: “Go big sis Iroha.!!”

Touka was cheering on Iroha while Ui and Nemu just watched.

Nemu: “Touka don’t be so loud.”

Touka: “We’re going to be fine.”

Nemu then glares at Touka.

Nemu: “Something could happen you know..”

Then a piece of the witch flies towards them and Touka grabs Ui and Nemu causing them to fall and Iroha turns around and gets distracted.

Iroha: “are you three alright..?!”

Touka: “Yeah we’re fine big sis Iroha but look out.!”

Iroha then turned around and was struck by the witch.

Nemu: “Big sis..”

Touka Ui and Nemu were holding onto each other until Iroha placed a shield over them.

Iroha: “Don’t worry about your big sister after all I’ll be fine..”

Iroha then attacks the witch until it was defeated and then transformed back into her uniform and collapsed to the ground.

Nemu: “Big sis..”

Touka: “Big sis Iroha.!”

The three walked over to her and look at her soul gem.

Touka: “Don’t worry big sis we can reduce the impurities..”

Nemu: “Yeah..”

Ui then nods her head and then they transform into their magical girl outfits and starts to use their powers to try and reduce the impurities but the impact caused it to fail.

Nemu: “It can’t fail no..”

Touka: “This is bad..”

Iroha then hugs the three tightly.

Iroha: “It’s okay don’t worry..”

Nemu: “But you’re going to become a witch..”

Iroha then sighs.

Iroha: “I’d rather turn into a witch than leave you three..”

Touka: “Big sis..”

Iroha’s soul gem darkened completely and Iroha turned into a witch named Giovanna Eve and Ui Touka and Nemu passed out because of the transformation and woke up in a bedroom shared for the 3 of them and Nemu wakes up.

Nemu: “My head..”

They were in pajamas and then Touka woke up.

Touka: “ow..”

And then Ui wakes up.

Touka: “Where are we..”

Nemu: “Since big sis became a witch we might be in her labyrinth..”