This is absolutely none of those things, except for it also being romance. This manga is unique, its fascinating, its enthralling, it's almost fluffless (something that shoudlb e impossible for a romcom that isn't a drama), it's clever, it's refreshing, especially the mc, it's well written, it is just so fucking good.
Maybe the simplest explanation what the charm is that it JUST SHOULD NOT WORK. Both of the main characters start of as shells of human beings, one of them a narcisist lacking even some of the simplest kinds of empathy, the other one just baely hiding hercomplete lack of self-worth. None of these two should get anywhere near romance in their current state, and that isn't even talking about the age difference. It just shouldn't work without being trashy.
It's one of the most exhilerating and incredible feeling to experience the author making it work anyway. I think this unironically became my favourit manga romance.
Of course, maybe even simpler: Tasku is the romcom mc you wanted to ave in every single series where you at any point ot frustrated by the mc or the main character lack of communcation.
