Hello!
I'm glad you're enjoying the update! Thank you for playing, ha ha.~
It's normal for them to repeat! You can turn off messages that you've seen already in the phone settings! You need to have the latest version of the game with the bug fixes for it to work though!
Dexter isn't entirely in the game yet, he's mostly being talked about. However, there is a secret way in which you can see a small cameo of him already!
Chalice and Solemn will be obtainable later, yes!
She was the one that mentioned the cat café for the first time! The characters are from me, but she helped me a lot with designing the interior and giving me ideas on what to do with the café.~
Sako records isn't anything that actually exists irl, it is something that me and Satan have planned for a side project.~ Unfortunately, I cannot tell any further details yet!