A) Ask Nina what her opinion on the whole thing is.
This is a very big decision. You're not entirely sure about what choice to make, and the visit from that demon didn't help matters any. You know one thing, though: this isn't a choice that is just yours to make. Nina came with you, and her say in this matter is just as important as yours. You turn your attention to her, and ask her what her thoughts on this are.
"I...I don't know." She says, lowering her eyes. "There's so much to take in about the...afterlife, isn't it? I'm not sure about what we should do, but that monster that...that...that sent us here is still at the school, isn't it?" She looks at Umbraria. "What will happen if we don't go back to try and stop it?"
Umbraria nods, gravely, as her mirthfulness vanishes into thin air. "Unless there's someone very brave, lucky, and resourceful among your school's students...they will die. By the dozens. There's a possibility that someone will rise up to stop that threat, but nothing more than that."
"We need to go back, then. We can't leave everyone to die! I think we should try to find an anchor...but whatever you choose, I'll follow you." There's a fire in Nina's words, in spite of her hesitating tone. She has said her piece, and is willing to accept the consequences of her preferred choice, but for some reason, she has left the decision up to you.
42) Your decision will determine the fate of both of your souls. What path will you follow?
A) Make the choice.
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Currently playing: League of Legends, Chrono Cross.
Current Projects: Fool's Overture, CYOA: http://www.gamefaqs.com/boards/8-gamefaqs-contests/60143513