Hunter x Hunter (2011)

S1E22 A x Dangerous x Watchdog

Gon, Kurapica, and Leorio reach Kukuroo Mountain, only to discover they can't approach the Zoldyck family estate. The mountain and its surrounding forest are entirely owned by the Zoldycks, secured behind a locked gate. Outside, they find a guard station, but the guard is more of a custodian, cleaning up after the watchdog that deals with trespassers. Determined to "rescue" Killua, Gon learns from the gatekeeper that the huge stone gate is the only way in without provoking the watchdog. Leorio attempts to budge the gate, but it won’t move. The gatekeeper explains that it opens in sections based on a person's strength, requiring an impressive two tons on each side just to shift the smallest part.