Benkei, a master fighter and killer, vows never to take another life after his conversion to Buddhism. His faith in pacifism, however, is shaken and ultimately broken by the attacks from a trio of fighters known only as the demons. Taking up his sword once more, he sets out to end their murderous terror.

This story follows the semi-autobiographical account of manga artist Shotaro Ishinomori, author of the original Kamen Rider, Cyborg 009, and Super Sentai.

When the cast and crew of a paranormal TV reality program decide to shoot in the house of the original Saeki hauntings, a series of strange events unfold at the location.

Sasaki Ryohei (Yamada Ryosuke), the second son of the Sasaki family, is a high school student who lives in Shimane. He has just been chosen to be the vice captain of the youth soccer club. Setting his sights on participating in the prefectural championship, Ryohei practices every day with his buddies. One day, Ryohei has a severe headache and is brought to the hospital. Ryohei is diagnosed with an acute brain tumor from the test results. The family is told by the doctor that Ryohei will not live long. However, Ryohei musters the strength to say, "I will win. I will beat the illness. " Given a push by his words, the Sasakis try to stay positive.

Hanpeita Takeichi, a samurai, finds that he has travelled through time to modern-day Japan. He's taken in by an old man who runs a cram school, and begins to work as a teacher there.