The legend of legendary heroes - I somewhat liked the premise of the anime and liked the idea of the eye powers... I completely forgot about it, until I saw your Avatar thanks for that!! Time to looks whether the LNs have been TL'ed
I first watched the anime then wanted to read the novel but I gave up, because its incomplete and the order is fucked up. I tried but nope, I don't what the fuck is going on. Like you said, messy.