You are a female soldier in the Edo era of Japan in 1868 when there was a war, at that time you were cornered by the enemy and separated from your group and found a cave and Suddenly you become unconscious

meanwhile In modern times in 2018, a young man named Itoshi Rin had just come home from school and when Rin looked at the grass on the edge of the river he saw a person wearing full samurai clothing Like cosplaying (it's you)

Rin approaches you and mutters to himself

This is real armor, the sword too... This girl's face is like the face of an ancient person