1. for luxury hotel you either max Nodoka relationship or pay the final debt, you need both to unlock everything thereHow the heck do you get the luxury hotel open?
From searching the thread seems likes its watching the last cinema date, but I can't get to unlock either, already got the rest of the dates and pretty much maxed on any other possibilities.
All that's missing is max out Rem is relationship, which is weird because I pretty much already brought out almost everything she offers.
Nodoka last relationship level is also being a pain because almost no events get it up and there is no way to boost.
2. for Rem you need to buy stuff in her store but for that you need to unlock it, by improving Nodoka's relations, lewdness, and fame (by paying off debt)
3. for Nodoka's relationship level: gifts + date at your and her home, also park; if you have the money - car shop, cinema, onsen, clothes store, hotel (after paying debt) dates