I really liked how childish and at the same time down to earth the DRAMA got in this, it accentuated both the period piece/of the time feeling of the manga with how specifically end of the bubble it was as well as enhanced the age gap romance between the two leads. I also really liked that dichotomy between her adolescent immaturity and desire to be seen as equal to truly have a place to call her own while not being so and his desire to protect her mixed with both carnal desire and plain love but also being implicit in the inherent inequality of an age gap relationship too, doesn't feel like other manga with the same concept nail it quite that well as this did usually. I think the aforementioned childishness of the drama really helped in that sense too.
It reminds me a lot of Maka Fushigi's work art and feeling wise, wonder if there's any connection between them both. Was getting some early Kumeta vibes at some point near the end too.
I really liked the high impact ending and the buildup to it in the volume, made me like Her Frankenstein more in retrospect too.
The manga in this are exactly what I love to find in stuff like the eroproject, unknown stories in a genre that is seldom very explored and is not really seen in a good eye usually, that feeling of discovery can truly enhance an already good read to the next level sometimes.