In Boruto: Naruto Next Generations New Episode (Episode 13: The Demon Beast Appears!) we can finally see who is behind all of these!
In the last episode, we can see Mitsuki telling Boruto that he knows who is behind the masked man. In the other side, adults were trying to find the person behind all of these!
In the start of episode 13, we can see Sai confirmed that the name of the plan left by a foundation member is called Gozu Tennou.
Sumire’s father, Tanuki Shigaraki trained her from a young age, in order to avenge Danzō Shimura. Eventually, he bestowed her with Gozu Tennō. After the death of her parents, Sumire became an orphan and created the identity of “Sumire Kakei”, deciding that it was best to wait and create a cover story before exacting her father’s plan. Sumire’s father entrusted her with the goal of summoning the Nue to blow up Konoha.
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