Fall 2015, The Asterisk War: On his first day in a "special" school the protagonist who's way more powerful that he seems sees a red head tsundere princess semi-naked, and is challenged by her to a sword fight where she uses fire. He ends up being her only friend, and she starts seeing him as a love interest. // Seems familiar... (see Chivalry of a Failed Knight)
Armin Mortazavi