Inumaki's Megaphone is used by Okkotsu Yuta as he copied Inumaki's Cursed Technique. This weapon has the movesets of Inumaki's Cursed Technique but is a one-time use.
Obtainment
There are various ways to obtain this weapon. It has a chance to drop from Curse Spirit: Baby, Stevenson Screen and is a move from Okkotsu's Cursed Technique