A high school senior, Yuuya Isehara. One day, Yuuya saw a highschool girl being summoned to another world right in front of his eyes. At that moment, a young salaryman jumped in to rescue her. However, the bag belonging to the said salaryman got stuck to Yuuya, resulting in Yuuya being caught up in another world summoning as well. But, during the transition to another world, the bag got detached from Yuuya and he ended up falling into another place, all alone. He fell right into the arms of a man clad in blood-stained armor. As far as Yuuya could see, there were nothing but corpses of monsters in the area. Hiiii!!! Yuuya ended up fainting from the shock and when he opened his eyes, he found himself laying on an unknown bed. The armored man suddenly took his armor off, stripping until he was completely naked. From the blood stained armor, there came an unbelievably handsome silver haired man. Once again, Yuuya was left flabbergasted. However, for some reason, the handsome man started undressing Yuuya without saying a word….!! Yuuya was easily taken by the socially awkward but incredibly handsome muscular knight, Ruto, who called Yuuya ‘my angel’. What will become of Yuuya?!