Here’s a natural Japanese example sentence, followed by an English translation:
エロゲで一番大事なのは、ストーリーとキャラクターの深さだと思う。 (Eroge de ichiban daiji na no wa, sutōrī to kyarakutā no fukasa da to omou.) eroge de
It sounds like you’re looking for a phrase or short passage beginning with (エロゲで…), likely as a prompt or example sentence. Here’s a natural Japanese example sentence, followed by
"I think the most important thing in an eroge is the depth of the story and characters." Here’s a natural Japanese example sentence