High-schooler Nishino Aoi is a history nut who's in the archery class at his school. Due to his skill in archery, he sometimes thinks that he's more suited to the Sengoku period of Japan. If he lived then, he imagines he might even have a girl like his clubmate Seno-san as his wife. As it is, Seno-san is his friend and the girlfriend of his childhood friend Kouta.
When a mysterious fog covers the school, Aoi gets his chance to experience the Sengoku period first hand. The entire school is tra...