Anyone knows the source for this? I tried reverse search but got nothing.
The hat is from a Kantai Collection character, anyway, if that helps any.
(C86) [Akuten Soushin (Kokutou Nikke)] Kanmusu Chakunin Hibiki Yakuduke Yokuryuu Choukyou | Ship Girls Pregnancy - Hibiki's Drug-craving Style Training (Kantai Collection -KanColle-) [English]