This is definitely a love story. I mean have you ever read any Yuu Watase sensei’s project which not contains of love? No, no no.
If you just happen to peep random volume and you see action scene….it’s just little spices for the big story.
Miaka was Suzaku and Taka was Tamahome. They are lovers in present time and in another world. But, both worlds are always related. In the world of 4 Gods, Suzaku and Tamahome are the heroes. Now, that world is in trouble. Miaka and Taka have to go there to save it.
Fushigi Yugii lasts in 8 volumes. if you want to read it online, you might want to try mangafox