Are you talking about the prince from the Royal Summons update back in May 2020? Also, apparently I was wrong. They released the second rebuild last July and then went back to their regularly scheduled "nothing but blog-style progress reports," which has been ongoing since then. I haven't really looked into that update, since apparently I didn't even realize it had ever come out. Looks like it included some sex scenes with the catboys from the first dungeon, along with more stuff involving other existing characters?
Honestly I wouldn't bet on this game long term. It was promising when I first found it, but the developers leave much to desire in terms of follow-through.