There’s a few songs here (most of which have been covered up for spoilers), so we’re starting with ‘after school stride’, which I don’t think I’ve ever heard of before.
First impressions are pretty good. I really like the rhythm of this song, and the PV moves pretty fast to compliment the song well.
Gumi sounds really good here as well. This tuning is probably the best Gumi I’ve ever heard to be honest. It’s go that perfect balance between sounding kind of realistic, but it still sounds like a Vocaloid, as it should (imo).
The lyrics are really fast and uplifting. It’s got a very happy anime-type style, and that’s demonstrated by the PV and art as well.
I… love this song. If this is anything to go by I’m really looking forward to covering the rest of your suggestions, @frozen-callisto. Please listen to this if you haven’t before.