(looks at author's note) "In Touhou doujinshi, Marisa becoming a youkai in the future is a very common theme. I was glad to be able to take a lighter approach to it here."

(re-reads pp. 23-24)

"... a lighter approach to it here."

Ooooookaaaaaay.

Base +5, TsunaKoo +6, Alixiron +3

I think both this doujinshi and its sequel (https://e-hentai.org/g/1927470/9b1e2d0a86/) leave you wanting more… it touches the "Marisa turning into a youkai magician" theme, but in a very superficial way. I know that was the intention of the author, but these two mangas are just about "Reimu could kill you Marisa, you know" and "Marisa turned into one and now mourns Reimu" respectively, and I think you could give more insight in between without crafting a 4 book series. It just lacks substance, and the author(s) in Bonfire's afterword tell you that they know it… What a shame.

Base +4