Reddit mentions of Crimzon & Clover II - The Tricky Wizard: Crimzon & Clover Short Story Series (Crimzon and Clover Short Story Series Book 2)

Aww yeah best game.

Yes, Type Z is Crimson Heart. I'd say the similarity is still pretty big in CC, there's minor differences but overall it's just scaled down and flipped around. But it's definitely not locked for no reason; I can't really say for CCWI as I actually haven't played it that much compared to CC, but Type Z is ridiculously overpowered in CC. Its break meter increases at almost double the rate of types I and II, and its shots and lock are both very powerful. It's gated off to show that the game was mostly balanced around Original Mode and Types I/II, and Unlimited and Type Z are both in there for cranking it up far past 11. Not something you'd really want to do on your first play of the game.