Yup, there's still a lot left to explain. :)
For example: who the Crimson Princess is, the sentence placed on inmates born inside the prison, why Tsugumi is so special and powerful, where Zuria-chan is, what a Cloven Veil actually means, inmates with hybrid energies, what happened to Raika and the previous Revenant team (spoiler: Raika is Kasumi's cousin, not her sister), the darker side of the Shinobi clan, who really is Revenant (MC), how enormous the prison is (really, really big), the metamorphosis thresholds, the scope of the transferred potential, the beneficial and adverse effects of the sacrifice catalyst, the Princess/Princes blessings, the burden imposed by the runes, why inmates don't try to escape or start a revolution, the Ashen Forest, how the Blood Veil duels are decided (chapter 3 explains that), what became of the last Akaashihara children, why “mentors” don't have an inmate combatant rank, etc., etc…
The story is just getting started, man!
I can't just dump every answer at once. If I did, the mystery would die instantly, the pacing would collapse, and the lore would become background noise instead of something meaningful. Everything has an explanation! Thanks for your feedback and support!