I've tried my best but I've had no luck remembering or finding this manga, and it doesn't help that I remember next to nothing about it's plot - but I do have three screenshots that I kept both due to the art, and in case I ever wanted to reread it... But I never thought to screenshot the name along with them at the time. Hopefully the links work 😁

https://68.media.tumblr.com/0493298ef05ef5f8ee4c32648e4ee960/tumblr_ottaw8KwZB1w1qw22o1_1280.png
https://68.media.tumblr.com/85b0b2280acfde54a893567c6a4df80f/tumblr_ottaw8KwZB1w1qw22o2_1280.png
https://68.media.tumblr.com/97a48d09160f8799f0186f509398c43e/tumblr_ottaw8KwZB1w1qw22o3_1280.png

Zattou ni Asobu Sakana

[img]http://i67.tinypic.com/2vbook7.png[/img]

Ahh! Thank you so much! I've been struggling to find it's name for days. Thank you, thank you, thank youuuu 🤣