To be honest, I think the male leads in this game are pretty problematic. For an MC who is as talented, beautiful, and wealthy as she is, it's totally fair that she didn't like them at first. Frankly, even after finishing the game, I still don't feel like any of them are worthy of her. The only one I found to be a great match for her was Kasuga, but since he isn't a love interest and the true ending completely shattered my expectations, I left with a pretty bad impression of the game.
That said, if you don't share my feelings for Kasuga, it's okay to just keep playing. I'd say Yagami's route is the most lighthearted, Ichiya's is quite heavy, and as for Shion - he's a 100% red flag (I can't stand him). Taiga is probably the most decent one?