In you watched Aomori-set series Flying Witch, you saw a hint of this in the finale, episode 12, “A Witch’s Robe and Different Ways to Spend the Day.”
Hirosaki Neputa Festival is a summer festival, designated an important intangible folk-cultural property of Japan in 1980, in which illuminated warrior-motif neputa parade floats, including the ougi-neputa (a fan-shaped neputa) and kumi neputa (a man-shaped neputa) are put on display.