Re: [RJ137447] 欲情勇者エリナの大冒険~世界を救うエロ物語~
So far it's been easy.
The nude "costume" is almost painfully easy to unlock, and once you do it doesn't become locked again as far as I can tell. It pumps up all your stats by 999. It doesn't give any special skills though.
Save for some rather interesting bits, it seems almost a complete ripoff of Ecchi Adventure, but is still proving worth playing.
By seems, I mean that it uses a similar story, leveling mechanic, and the same resources. It does improve on some things (in my opinion) but other things not so much.
I still haven't figured out how to get any of the extra costumes, but it seems that you don't have to go running around to find the quests.