Fourth Inkwell Isle War

"After three Inkwell Isle Wars, Inkwell Isle's been reaching new heights when the Fourth Inkwell Isle War just happened right now. It seems that Inkwell Isle's not a safe place to be anymore. However, it looks like that I'm having a good idea to save Inkwell Isle from the evils of the Khmer Rouge during the Rubyism Conflict."

--Su Ji-Hoon, Inkwell Isle is Not Safe Anymore

The Fourth Inkwell Isle War is new conflict between nations and factions in Inkwell Isle (except Carlite) ,Cuphead bosses and cup characters against Rubyists and Khmer Rouge in Rubyism Conflict

The cause of this war is many nations (except some nations in Inkwell Isle of who not being attacked by USRAC) and everyone in Inkwell Isle are facted Rubyism can make Unified Soviet Red Assault Command and Beleninsk Pact invade three times,so starting to against Rubyism,so that Cuphead bosses and Cup characters follow to against Rubyism.

While they attacking Rubyism,the Khmer Rouge,terrorists,genocide dictators and their allies attacked and capture both General Chén,Lê Cốc Đài Phương,Nương The Coconut Candy and their vietnamese soldiers (because of knowing Vietnamese can beat Khmer Rouge in past) with kidnapped other : Cuphead,Mugman,Ms. Chalice,Lewis Cuper,Mr. Palayok,Anthony Tasse, Yamato Kappu, the Cup Kid Squad, and more, but even capture some civilians of Inkwell Isle for tortures and massacres.

And happened to in aftermath that Cuphead bosses and everyone of Inkwell Isle trying to rescue them,so that Grand Alliance will support to battle.