Guys, I won in crystal cave event, is it repeatable? Wanna lost there too)
Yes, it's quite repeatable.
But this location is not considered as a 'dungeon', so you can't get back there using the 'Go in a dungeon' sub-menu when hunting with Eric.
You must still use the 'Hunt' submenu; and there is a lot of possible choices (including each time both 'standard' hunt and dungeon scenes), so it can take some times before you get it again.
See here -for instance- for all the possible choices:
https://f95zone.to/threads/warlock-and-boobs-v0-350-0-3-boobsgames.18692/post-2869951
Anyway, the choice is determined randomly each time you start a new hunt, so:
- save just before talking to Eric before hunting,
- you have up to 3 possible hunt scenes. Each time you enter one and it's not the one you wish to get, immediately exit to switch to another one.
- if after the 3 choices, you've been unlucky, re-load your previous save and start again.