School Life Of A Mercenary GirlSaikyou no Youhei Shoujo no Gakuen Seikatsu; 最強の傭兵少女の学園生活 ―少女と少女、邂逅する―; School Life of a Mercenary Girl

Cierra, a young girl whose been a skilled mercenary her whole life, decides to retire from being a mercenary and try to live like a regular school girl. While at her new school, Cierra befriends Alna, a young noble girl who's being targeted by assassins, and vows to protect her.