In the TV version of the ED, Teenage Blue, the visuals started at the gym as an establishing shot and then treats the characters equally well, (unlike ED 2, which seems to make Hina prominent).
How does the MV of the full version compare?
The video starts by following a certain girl. After some time, we follow another girl. It turns out that they are close friends, and we see lots of running around the classroom.
With these two girls, it's clear that the full MV's visuals don't match the story of Blue Box. One might think that the anime is either yuri or yuri bait because of the MV's portrayal of the girls. I don't take issue with this MV but some may do.
Eve is a good singer. I love his OP for Shoushimin, and you will love his ED 1 for Blue Box. It has a positive message and the tempo is upbeat.