Magia Record: Mahou Shoujo Madoka☆Magica Gaiden - Mifuyu no Owaranai Yakusoku (Doujinshi)

Aren't you afraid to be outside Kamihama?" Iroha is confused by Mifuyu's question. However, they are in Mitakihara, where the Doppel system is not working and suddenly Yachiyo's Soul Gem turns dark.... Will Mifuyu be able to keep her promise to Yachiyo to stop her conversion to a witch? And what about Iroha?