I actually read this by mistake...i thought it was something else. I only noticed when the plot didn't go quite how i expected lol.

Its a cute story but not original or anything amazing.

The story goes, Sakurai meets a boy at the beach, they have fun, spend the day together, and then it turns out they go to the same school.
She vows to look for him once school has started.When she finally does see him again, hes addressed as Sensi.Turns out hes her economics teacher
[i think its actually meant to be home ec teacher, they talk about family and cooking not the global market...]. The story continues with Sakurai learning to sort out her feelings and deciding what she really wants.

The character development on sakurai's part wasnt bad, I actually liked her a lot. She's blunt, honest, actually has a backbone...
Hagiwara [sensi] was left kind of vague. Whatever he's thinking and feeling isn't clear, he just happy-go-lucky and all smiles.
Yuushi's character was also pretty good, he's very relatable. I liked his character progression and although the concept isn't new, i liked what he did for the story.

One complaint, I don't get the title. After reading what the author explained chocolate cosmos to mean, I'm confused why she decided to name the manga after it.

It wasn't a bad read, I'd recommend it.
Would I read it again? Probably not.

Story: 7 [good]
Art: 8 [very good]
Character: 8 [very good]
Enjoyment: 7 [good]
Overall: 7 [good]