Mahou Shoujo Nante Mou Ii Desu Kara.

Chapter 32
Chapter 31
Vol.3 Chapter 33
Chapter 31
Vol.3 Chapter 33
The story revolves around Yuzuka Hanami, who is approached by a mysterious creature that tells her she has the makings of becoming a magical girl. However, Yuzuka's magical form has her wearing a swimsuit!