Ever had a knee jerk reaction just from a show's opening?
That's Taishou for me. A story about a sad boy being sad and the /manic pixie/ dream girl that "saves" him. I grew up in the 90s and early 2000s. This genre was practically invited back then and it completely saturated the market back in the day. I guess Japan, like Disney, really is 20 years behind trends...
Now the catch here is that she's a granny. Nope, that's it. Think of the ideal grandma, the sweet one that does all the housework perfectly, makes the best food and can sew. Yeah, now place her in a childlike body and you have this show. Because heaven forbid we don't infantilize women. Sorta made worse by having the boy practically tower over her, I get that tall = handsome is most Otome stories but this just looks like a pedo entrapment show!
The rest is what you'd expect from this kind of story really. /manic/ is loved by all from the start, super happy all the time even when it makes no sense for her to be and she saves sad boy by bringing him out of his shell. In return sad boy is handsome, super tall, rich, gets good grades and is the author's ideal only with better hair.
And here is the issue I have with this trope. The characters are empty. Sad Boy usually feels more real since we get his inner monologue in stories like this but Manic doesn't really have her own identity, she is whatever will make sad boy happy (bra size included!). It makes sense that she was "bought" for him now doesn't it... By the way I find it problematic that this premise is ok in this day and age. It's a common one is BL to force the couple together but in a supposed romantic show??? There is some lip service paid towards this but that's all it amounts to, lip service.
It gets a few points since some of the situations are cute. Also the old timey 1920s aesthetic is charming and does work with manic's grandma persona. Over all it's not too bad but if you're not into this specific trope then you won't like it.