I would say Olympus(purposely ignoring the latter two because I haven't read them in full yet and I will be far far away from this commuity when seven comes around) it brought the hype then some even till today I'm just discovering the most amazing things within the story and I've read at least 5 times. About it's a story that the part 5.1 I like most broken gods and humans a world that I have been around for way too long and is dying inside.
Zeus is broken Musashi is broken Wodime's broken both sets of twins are broken Ritsuka broken but the question all lies in the way they deal with said sense of brokeness. It does this while also hinting a future plot lines amazingly. I think the only bad part is how basic Demeter is like yeah she's in theme with the broken gods and is suppose to represent essentially the introduction to them but geez they went into that hard as crap.