I don't mean any offense, but the names could use a lot of work.
At the very least, please change at least hikouki's name. I'm assuming Hourousha means wanderer, which still sounds kind of.... silly, but you can keep it if you want to so badly. But the part I laughed out loud is her first name, Hikouki. It means plane.
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As in Airplane. (Unless this was deliberate? As in something like 飛行鬼? Still, please change it, the first thing that comes to mind is an airplane)
Uh, next one. Kakushiwa Neicha. Kakushiwa means something like hidden, I'm assuming. Doesn't sound as bad, but a blatantly obvious reference to her ability. Neicha is just Nature, then. Not as bad as Hikouki's.
Now the last one, Kaketeiru Kurayami. Kaketeiru has way too many possibilities for me to predict which meaning it is. However, I should mention that the word Kake-teiru is in the "is Verb-ing" or "is Verb-ed" form. For example, Kizutsui-teiru means "is injured". Kurayami is dark darkness. It works, I guess, but sounds too straightforward and simple. Kind of like the name of that one ice lollipop girl from that vampire harem anime.
Like I said before, don't be offended though I sounded rather offensive. Just take it to heart, and if it convinced you, I hope you change it. If it didn't, then I still wish you luck with this project.
