Okay time to write the guide.
Part 1
Scene with Elith. Get Selena body ration, so Cephrina would become an owner. Start a fight with Elith and intentionally lose to gain relationship gain.
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This will be important later on because after you buy mindflayer egg from mystery shop, you have to come up to Elith and ask her to help hatch it. Then wait for a few days.
Part 2
Kinda forgot where furnace fields were, so had to check around for a bit
Go into portal and enter Lucina's shop
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keep exploring untill you reach this area
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go hunt this shit again
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don't come wearing these because you can't use celestian form manually
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Fight with gluttony. Use timestop first after transforming into celestian, otherwise you'll get consumed inside
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rince and repeat until you defeat him
after defeating the gluttony general, get those goo star fish on you. Go to the bridge.
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defeating the shade rewards you with nothing, so just let yourself be defeated. Warning, don't use charm on the shade while still having those goo starfish on you. Let the shade remove them from you first.
get goo on you again and go to the bridge to meet new ghost sabre sister.
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now let them have their way with you. You have to do this 3 times for each sister. Then you'll unlock their homes.
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Everything else is pretty self explanatory, Get Faylen free if she's on the pirate ship, visit your home and Nel would automatically possess you (cutscene) for spirit training, where you learn on how to teleport to your bodies (Doll, Faylen, Celica)
With Domenea (Mistress demon), just visit her home and then talk. You have option to remove her from relationship status entirely but I decide to keep her on my run (because I prefer harem route), degrading your relationship into obsessive and possessive one.