Boku No Joshiryoku Wa Ano Ko No Pantsu Ni Tsumatteiru.

Akira Miwa (15) is an ordinary girl who likes boys. One morning, she wakes up to find that she has been cursed and turned into a boy! In order to return to her original body, she has no choice but to regain her feminine power by stealing and putting on "Maiden in love’s Lucky Panties"! Enduring shame and fear, she chases after every pair she can find.