random food for thought. if you want to theorise yourself, don't look through this. Minor spoilers.
Do note that I am not 100% confident in this, so take this with a grain of salt. Reading back at this, this is NOT well written, holy.
TL:DR: The events of Dawn Chorus is actually a big flashback. Why? I'm not too sure. This one is a massive stretch, but with what is said, it's possible that any love interest that Arvo gets in is not actually permanent.
I was curious about the meaning of this VN, so after a little studying, I quickly realised that chance and time are big concepts in Dawn Chorus. Seeing Saturn will always occur, which also happens to symbolise time. Lets go through the opening intro:
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We're ships at sea, drifting in all directions.
The wind blows relentlessly, pulling us apart.
One moment I share with you, the next we're almost strangers.
Is genuine connection ever really possible?
All I know is that I'd give all I have for just a moment of it.
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As some people know, Arvo writes some poetry on his phone. You can see this near the end of Rune's day 4 where the both are on the bus returning from the city. And knowing that, I get the strong feeling that this was written either before the camp or after the camp.
"One moment I share with you, the next we're almost strangers." If Arvo written this before the camp, he could be referring to Mikko, but that only applies if Mikko's route is the canon ending, but I doubt that.
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"We're all lost in this world, walking blindly in the dark, colliding with each other. Our lives are a series of random encounters that shape our cause."
"Are we swimming, or are we carried along by the currents?"
These quotes are said right after the intro, in Arvo's dream of winning the Nordic Street Photo Award. These refer to chance, and question whether if fate exists or not. On Lake's route, they question about reincarnation, a second chance, essentially. Jørgen responds with just being happy with your current life.
I'm still trying to get more info about all this, since I don't have a lot of evidence.