" The application “Cleartil Boarding School” can’t be opened. "
Viewing post in Cleartil Boarding School (REMAKE) comments
Does it say anything about the developer not being verified? I know Mac doesn't allow games with no publishers by default, so you may want to try this tutorial I found: https://www.youtube.com/watch?v=NOW5dyA_JgY. That is, unless you've done this before.