Hanaoka Saki

Yoichi plays basketball at his junior high and is capable. He is granted a scholarship and attends a high school with a superlative basket team. Instead of welcoming the boy the students there decide to bully and harass the new player leading Yoichi to a new high school and basketball team. Expectedly, the basketball team is not the best. The team will have to soon play against the team from the school Yoichi was in before.

Students, including Aoi Nishino, take part in class and sports activity at a prestigious high school. Aoi Nishino is a member of the school's archery club. He practices archery studiously and doesn't socialize much with the other students. His childhood friend Haruka Seno is also a member of the archery club, but she worries about Aoi Nishino. One day, thunder strikes the school grounds. After that, the ordinary lives of the students changes drastically. Many samurai descend on the school grounds. It appears that the entire school has traveled back in time to the Sengoku period. Making things worse, they realize that they are in the time right before the Battle of Okehazama takes place.