This is definitely one of karaagetarou's best work and this is such a nice story with Marisa challenging Aya and all, and how Nitori is so passionate about what she discovers and makes is so in-character for them
and i can see the author really put his (?) best efforts into these especially that panel of aya at the end and the times where marisa just suddenly speeds up
usually im more of a sucker for feel good wholesome stories (such as the other works of this guy but with the members of SDM) but this was just too intriguing to pass off, although im late by a few years, i'll definitely want to come back to this and read it again