Manga by author Mokufuu

She'll blow punishing fists with a smile! A super crazy heroine from another world appears!Delice Fahrenheit is from the real-world who has become an outstanding world-class famous wizard. Haruna Katsuragi who is also from the real-world applies to be his disciple. As a person from the real-world, her status was unprecedentedly low. However, through her training with Delice, will her hidden talents finally be revealed? The isekai-fantasy, master-disciple story begins.

A man wakes up one morning to find out he is now a girl - and he also now has a sister.

Shuichi, a high school student, ended up marrying his childhood friend whom he thought was a boy. At their reunion after 10 years, his childhood friend Yuika had transformed into a beautiful girl, which initially made Shuichi quite nervous. However, as time passed, he gradually grew accustomed to the sense of closeness as best friendsand thus, their love story as an ideal couple with a charming touch of innocence begins!