S1·E161 The Castle of Nightmares

The Hashirama Cell was extracted from the body of the First Hokage Senju Hashirama, and depending on how it is handled, its power to stimulate life energy to explosive proportions makes it extremely dangerous. Boruto and the others learn that the cell is in the hands of a wealthy individual who lives in Fushuu Castle, and plan on retrieving it. But there are others who are after it as well.