The Ultimates of Danganronpa X6
I feel like the ultimate Activist, Haki, might be one of the culprits? Maybe she kills the ultimate professor?
𝕋𝕨𝕠 ℂ𝕒𝕝𝕚𝕗𝕠𝕣𝕟𝕚𝕒 𝕍𝕒𝕝𝕝𝕖𝕪 𝔹𝕠𝕪𝕤 ...
Since you were the first commenter, I’ll give you the first motive:the dolphins native to the area