Sakura Motomachi, Tokyo in the 1960s. Shin, a boy who lived happily, despite being poor, loses his mother, his only family member, and falls into deep misfortune. Itsuki, a boy who saves Shin. He also lost his older sister. Those two boys are joined by Tae, a girl who can see Yo-kai, and together with Shin's guardian spirit Sū-san, and new Yo-kai such as Nekomata, they take on a mysterious incident in order to retrieve the souls of their precious family! And what is the shocking truth that awaits them...!? This is a story about the friendship formed between three children and Yo-kai.
1960年代、東京。下町シンは病弱な母親と二人で暮らしていた。ある日、母親が何かに取り憑かれたように走り出し、車にぶつかって亡くなってしまう。落ち込んで川に飛び込もうとしたシンは、高城イツキから声をかけられた。イツキは自分の姉が妖怪に取り憑かれて殺されたといい、シンの母も妖怪に取り憑かれていたと語る。妖怪に復讐しようと考えたシンとイツキは、妖怪が見えるという少女・有星タエと共に、妖怪ウォッチを探しに行くが…。
