Yuubae Sakusen

During a school day, Suzuka Shigeru receives a text from classmate Kazama Akio, who claims to have something interesting to show. Curious, Shigeru goes to Akio's large, historic home. There, they find three Shinto gates in the backyard. As the sun sets and their shadows overlap, a glowing light appears at their intersection. Driven by curiosity, Akio and Shigeru step through the light. They are suddenly transported to feudal Japan, during a conflict between the Iga and Kazama ninja clans.