hmm... not sure what you need. ≖_≖
You've seen basically everything after defeating Katana-tan.
Before you can go to Kanata-tan, you must complete the game at least once without losing the Eros Logo in the bottom right corner.
Important, you must enter the portal in the sanctuary twice with this logo active.
The Curse Mode is optional stuff.
Strongest Accessory (Gauntlet) can be obtained by surviving the bath event in the slums.
Katana-tan is in the Snow Town.
There is also a way to get 100% completion within the first minute of the Game. The NPC in the dev room will tell you that.