9-1 is a puzzle based spell a la Extra Stage Spell Cards...
Ugh, its kinda hard to explain with words (And English isn't my home language so it makes it even harder to explain), but it basically consists of "Rising" (Hence spell card name) towards Kanako at the moment she summons the lasers/bullets at the top...
Probably should watch a video for this one...
Believe me, even with knowing the trick, the timing for it to work is rather small IMO.
Its the hardest day 9 scene for a reason!
BTW do you plan to No Item the whole game? If so, you should be aware than all days have 1 particular tricky scene to No Item that is WAY harder to No Item than the other scenes from these days.
IMO, the hardest scenes per day:
Day 4: 4-6 is hellish. But its actually rather easy when compared to the others...
Day 5: 5-2...
Hardest scene to No Item in the ENTIRE GAME, IMO. Enough said. If you can pull this one off, you will probably be able to do all others.
Day 6: 6-5 Mainly because its a RNG tests due to these lasers :/
Day 7: 7-4 Actually somewhat easier than the others.
Day 8: 8-6... Well its just hard and also somewhat luck based.
Day 9: Already stated in this very same post
Day 10: 10-4, of course! (But hey, it is actually fun to do!...)
All of this is based on my personal experience and its of course my opinion... maybe you find another scene harder than those in these days, but quite honestly, the difference in difficulty is fairly noticeable...
And finally, if you DONT intend to No Item the entire game, then ignore this post I guess xD