This week's Arcade Archives release is... Scion (Seibu Kaihatsu, 1984)
Arcade Archives (previous-gen consoles)
PSN
 
Switch
EU
 
 
Arcade Archives 2 (current-gen consoles)
PSN
 
Switch 2
EU
 
Xbox
Just the one ROM for this, so we don't get the Cinematronics-licensed version. Preference Settings allow players to toggle a bug that, under certain conditions, lets you advance beyond Scene 999 (good luck getting that far!). 
It's shmup time again, and once more I'm out of my depth! I'll do my best though, this one's pretty interesting. At first brush this seems to take a few cues from Xevious (as was the style at the time) but this is actually a little different. Taking flight in your Mana Jatatei (that's a fighter jet, the manual says so), you've got to save your fellow citizens trapped inside the super-city Crystal Heaven by digging through the city's layers to get to the core. Each loop is split into four short segments with the first three focusing on you destroying each layer piece by piece. You only start with an anti-air weapon, but special enemies will drop an air-to-surface weapon for you to grab, which you'll use to destroy the weak parts of each layet to destroy it and move down to the next one (which is presented really well, once you blast all the weak points the whole thing crumbles), but if you miss a few targets, the area loops so this is essentially a looping bombing run. On the final layer, a few more ground targets need to be taken out before you can destroy the city's core, and then the game moves to the next loop of four scenes. You have to be careful though- the air-to-ground missile is a physical attachment to your ship, and it can be destroyed by enemy fire so you'll need to grab another one before continuing with your mision!
This is a pretty interesting one- it differs a lot from Xevious in terms of mechanics and structure, the presentation is nice and colourful and there's even some arcane secrets for things like warping ahead by bombing secret targets and extra lives by bombing the weak spots in a certain order. It is, however, quite difficult even for a shooter of this vintage, mostly because your special weapon will get shot down and you have to survive pretty relentless enemy waves until you get another one (if you're lucky it'll appear quickly, and if not you'll have to hold out for a while). If you're interested in early shmup history, this is definitely worth a look, and it's another one I didn't really know existed! 
... By the way, they're selling the Dacholer shirt now. It's real. 
Here's the UK link, 
here's the US link. Dacholer.