[larethian]

Ok, I finished Fione arc. Didn't really time myself, about 10 to 12 hours I'd say, though I went through the prologue very fast (which I recall was about 5-6 hours or so of length previously). There's a new collectible CG and about 10% of the dialogue in the prologue are new. Nothing major though. And Orz has a face now.

why I say it's an arc rather than a route:

Spoiler for apparent game structure, no story spoilers:

Since I've only done Fione, everything is based on that for now, so don't take it for the gospel truth for the rest, though I reckoned that it will be a similar structure.

There's actually only one route; ie. the Main route. The route is divided into arcs, where 90% or more of the interactions is with the heroine of that arc. This is the order of the arcs after the prologue, and it's a no brainer in the VN.

Fione
Eris (currently on it)
Coletto (assumed from walkthrough)
Rabiria (assumed from walkthrough)
Licia (assumed from walkthrough)
Eustia (assumed from walkthrough)

Based on the CG gallary; Coletto is apparently Saint Irene, and Rabiria is her aide; and they are grouped together, so they probably don't have a lot of individual CGs. Iris, Risa, and Claudia are grouped together. There's a Bust Up section in the gallery, which I wonder what is it? I've yet to unlock anything there.

Late in the arc, there will be a branch, where you either complete the arc to move on in the main route, or branch off to the arc's heroine's ending. After you get to a heroine ending, there will be omake sections unlocked (labelled Appendix for some obscure reason to me), though unlike Fortune Arterial, you actually get H-scenes in the omake.

Spoiler for minor Fione 'route' spoilers not related to main story:

Boring, plain boring. After settling a major event at the branch point, it's just a slice-of-life love story of about 40 minutes (excluding H-scenes) or so of worthless, erm, crap? Caim's motivation to search for the truth behind the light he saw at Gran Forte was totally gone. It seems like this VN was just designed to have one route, and the side branches are just fan-service folder. No sub-arc/sub-plot, nothing challenging happens to the couple, nothing significant happens in the branch that will provoke more questions. In fact, you can actually just click through it to get the CGs and the ending to unlock the extras.