I watched this anime growing up in the 90s. I might be a bit bias since I watched the Arabic Dub of it not the sub. Haikara-san go Tooru was known as Benio in the arabic Dub and as "here comes miss modern" in Japanese. Plot = 9/10 In 1920 the young Benio has an embarrassing encounter with the VERY handsome army lieutenant Shinobu Ijuin. Between that, her classmate whispering in her ear about being a "modern woman" and her father announcing that he arranged her marriage to this stranger and that she must leave her home to leave with him... well she rebelled ofcourse. The entire plotis about the clash of the old ways and the new with Benio's fiery personality reflecting it. The uncertain times that japan was going through and how to adapt as well as how the role women played changed during that time period. It weakens near the end of the show as the war and it's aftermath roll in though.

Characters = 8/10

There is nothing new here. The characters are very stereotyped for Shoujo manga (which this is based on). They are however true to type and act according to it.
Benio is the standout, although fiery and extroverted tomboy her youth makes her mailable and easily influenced by those around her.
The side characters all have their classic parts. The childhood friend that loves her but it's one-sided. The elegant classmate that she is admires. The... servant that treats her like a mafia boss???
Even within their established roles they all have their own personalities and motives which keeps things interesting.
The only that doesn't is Ijuin, the love interest. His role is to look pretty... that's about it. Even then the anime dives into his background to explain why he's like that with little character moments throughout that endear him to the viewer.

Animation and art = 8/10

This was made in the late 70s and it shows. Animation is a bit choppy at times however the style and character designs are distinct and very expressive.

Music and sound = ???/10

Again I watched the arabic dub. the theme song was literally "Benio, Benio, how cute she is. Everyone that meets her is happy!" Repeat till the credits end...

Overall = 8/10

This show is such an under appreciated gem and deserves more recognition as a classic. The animation is dated but still charming.