My bet on Tewi fails huh,
anyways, seeing Kangu's reply to my comment. it made me think of something. Though I won't say it here due to lack of confirmation. Anyways, I will agree on Marisa at this part. Reimu... feels off. I know Reimu acts different on different canon manga. This Reimu on this chapter just feel really weird and something a fanon Reimu would do so I would like to think Reimu is possessed.
But so far I think the story is going to a good direction. I would be waiting for the next chapter next month (and treat it as a Christmas gift lol)
And we still don't have an ID on the spirit. (Although, some of us have an idea who it may be)