Reijou Alice no Eiyuutan: Kizoku no Shoujo ni Tensei shita Eiyuu wa Yagate Saikyou to Nari Hitobito wo Sukuu Tame Musou suru

Once hailed as a hero, his life was cut short by a blade... only to be reborn as a feeble young girl! Although overprotected by his maid, Sakuna, he will rise again to save those in need!

(Source: Shueisha, translated)