Hello.

I can't for the life of me remember the name of this manga, but it generally went something like this. It's in a high school setting with multiple main characters in one-sided love with each other that it forms some sort of a circle. Eg, A loves B who loves C who loves D who loves E ... who ultimately loves A. No joke, there are a lot of characters involved in this love polygon.

The genre was either shounen or seinen. Cute art too.

Any help is much appreciated

I don't think it's what you are looking for, but Wa! (KOJIMA Akira) certainly fits the criteria.

Shounen in Love Polygon category
Seinen in Love Polygon category

It might not be in the category, though...

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世界のどこかに 必ず
キミの居場所が ある筈

Honey and Clover is a Josei... but a love polygon.

It's actually a specific manga that I read long ago. And Wa! (KOJIMA Akira) is the one. Thank you very much!