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 transported to a time period that Aoi pinpoints as somewhere between 1576-1582, near to Azuchi Castle. However, things are not as bright as he might have imagined. Armed men accompanying the historical figure Hachisuka Koroku attack the school, brutally murdering teachers and students. Will Aoi and his friends be able to survive this deadly era?

Isamu doesn't stand out, and everyone calls him a "side character" behind his back. Even his passion for running doesn't get him anywhere on the track team, so he spends his nights languishing at a low-paying part-time job. It feels like everything he's holding in is going to boil over, but when people start getting infected with a mysterious illness that turns them into monsters when sexually aroused, he will have to learn how to control the urges he has pent up inside in order to survive.

A battle between modern-day thugs and Sengoku warlords!! "What do you think is the difference between a murderer and a wartime hero?" This is the question put forward to Michiro, a college student and aspiring mountain rescuer, by his younger brother Makoto, who is being held in prison on suspicion of the attempted murder of a friend. Michiro replies that it is a matter of justice, but Makoto believes that it is simply a matter of the era. As Makoto is handed an unsuspended sentence and Michiro is at his wit's end, suddenly, a red rain begins to fall, and the area is enveloped in fog. Thus, Michiro, along with the entire prison, is sent to the Sengoku Era…