I'm not certain if you posted this looking for a quality check, but I assumed you had and so went over it a little. ^^;
Page 004 - It's a minor pet peeve of mine when word balloons that separate an ongoing statement don't have some sort of punctuation bridge, but the speaker's statement could use a comma after "walk" regardless.
Page 006, panel 2 - ...evening, Reimu.
panel 4 - More importantly,
Page 012, panel 4 - ...who's going,
Page 014, panel 3 - And you, Yukari?
That's all I could spot, the grammar police in me coming out. Thank you~!