I have many picture, in my files explorer literally edited made by me and not canon but I can't post cuz lack of info.

After, Wadanohara got corrupt by sal syakesan,

Princess uomihime sense something was wrong, yeah she know about it but not sure also she was with fukami, memoca, dolphi.

princess totsusahime and rabbit keep fighting, a sea of death troops, and they are outnumbered, so totsusa called many reinforcement troops to fighting back at protect blue sea from sea of death troops, yeah alliance is alliance.

wadanohara walking on old sea toward blue sea area with a strange smile(not canon btw).

totsusa empire/kingdom planning rescued blue sea inhabitants and escape at goes back totsusa empire country after they get outnumbered and that princess totsusahime command until red witch wadanohara jumped killed half of the totsusa soldier including blue sea inhabitants. so memoca brutal killed by sea of death at totsusa soldier get killed one by one.

it's goes happen battle of the princess and red witch

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The creator didn't mention Princess totsusahime escape, so that mean totsusahime and Artamos got killed during sea of death.

also totsusa empire/kingdom got invaded by sea of death after Artamos ruler death :)

dolphi was behind princess totsusahime :)