|Manga||Volume #5, Boruto Chapter #16|
As Konohamaru noted, Mugino was a man of utter selflessness. He would sooner sacrifice himself let himself become a burden to his allies. Mugino proved this when confronted by Ao, attempting to stop the enemy by committing a suicidal-kill assault.
After an airship crashed on the outskirts of the village, he and Konohamaru Sarutobi were assigned the task of investigating the wreckage. While he stood guard outside as Konohamaru ventured into the wreckage, he was attacked by an unseen foe. When Konohamaru rushed to his aid, Mugino cursed his carelessness as he slumped to the ground.
Mugino is taken by Konohamaru to a nearby cave to flee from the autonomous puppets guarding the blimp, where Konohamaru tends to his wounds. After the rest of Team Konohamaru arrives with Katasuke, they catch each other up on the recent events. When Ao attacks them, Mugino attempts to restrain Ao, and is fatally injured by a concelled energy blade within the Kiri-nin's prosthetic arm. Instead, Mugino opts to collapse the cave on Ao and himself to give the others a chance to escape.