I don't know the details, but...despite being a youkai who can read minds, Koishi has apparently closed the third eye she needs for that mind-reading ability. While this means Koishi has lost the ability peculiar to her species to read the hearts of others, in return, she has gained the ability of "acting with the unconscious". Doesn't it seem that this isn't a literal meaning, but that it must be the ability to keep anyone from sensing her actions by shifting gaps in others' consciousnesses? Also, it seems she also uses danmaku utilizing a deep psyche on a par with her sister's. Do any of these require particular caution? If so, I'll need countermeasures and data...