she absolutely falls for his normal man prince exterior in the pre timeskip, choosing to believe that any moments in which he's very visibly unwell/violent aren't the real him, and then convincing herself that he's been possessed by a demon or a ghost or something when he goes off the deep end, and then she would go off the deep end too.
shion tends to heavily romanticize the people she falls for (or otherwise loves) and reacts... poorly, when that fantasy version of them is proven wrong. see in meguri when she tries to kill satoko after satoko admits she's given up on seeing satoshi again.
in the sub he calls himself "manjoume thunder" because his name and insistence on being called "san" at the end of it resulted in a pun hurricane of people accidentally thinking he was telling people his name is "manjoume sanda" (sanda meaning thunder)