itch.io

I'm assuming you said partner as in the love interests, right? Well, there's a lot but for starters go to the abandoned warehouse at the bottom right side of abandoned town/the city you first start in after getting out of the ruined lab

There would be 2 more partners you can easily get 0<0

Rinny (Succubus?) - assuming you found the key to the locked gate in the abandoned town from the warehouse that the catgirl (Cassie) is staying at, explore the entirety of the park where you came upon a succubus currently being harrased by fairies

Fawn (Deer) - Fawn usually appears for the first time after you buy your room in the New Ark City's hotel. "^^