Seraph of the End (2015)

S1E13 Scroll 13: Whiskers and The Engagement Ring

Yousuke and Nanami volunteer to look after a neighborhood bakery, but their good deed takes a chaotic turn when they lose Nanami’s engagement ring. Their frantic search leads them straight into a bizarre confrontation with an army of Jakanja Chuunin, all brainwashed by sinister mustaches. Now, they must fight through the possessed soldiers to recover the ring before it’s too late.