The premise was that there was a confession between a glasses wearing female lead and her popular/athlete childhood friend (who secretly does love her) which was turned down in the past and so she and her other single friends make up a group of girls who are unlucky in love. The FL may have referred to her and her group of friends as jellyfish or something similar (although I'm sure it's not Jellyfish Princess bc the arts different).The FL and her childhood friend gradually realize their love for each other, and the ML's friends also get paired up with the FL's friends. There was a short character with a uniquely drawn face that I can recall who was paired with a stoic looking guy, and also a gyaru I think.

Any help would be greatly appreciated!!

Edit: there may not have been a confession, it may have just been the ML saying he doesn't love the FL to his friends or something like that. Either way, the FL believes he doesn't love her.

I found it, it's Anagura Amelie