I can't speak for the entirety of the series since I've dropped it at the 3rd episode, but from what I've seen it's pretty mediocre. Yes, it's cute, but it's that type of cute where you can tell they're trying reallyyy hard to come across that way.
The actors are both around 25 years old, and their characters must be around 22 and 19 respectively. How come the younger character acts like an 8 year old? Yes, he's a freshman, and therefore younger than his partner, but so am I, and I have never seen anyone my age act that way. I have no problem with some cute moments, but when the entirety of the character's personality is based on being cute, quirky, and pouty like a child it really does bother me.
The length of the episodes irked me, and I don't know why, because I've watched series much shorter than that (First Love story only has 2 episodes of around 9 mins each) and loved them - but in this one it just feels like nothing is happening at all. And considering how this series only has 9 episodes, I'm just wondering, where is the story going?
I would recommend watching 'Cherry Blossoms After Winter' instead of this one, or even better, 'Our Dating Sim'. The latter is an example of how to write cute characters without infantilizing them.