My partner and I are playing this in a multi-session game, and it has been absolutely delightful! My partner is new to RPGs, and the rules have been both easy to learn and interesting. I love that the Belonging outside Belonging system encourages players to make hard or unpredictable moves against each other; it's kept our magic system exciting, high-stakes, and emotional. Would definitely play again in a group of 2-6 players, including as a way to introduce folks to BoB or RPGs in general.
Reminds me of: the Earthsea trilogy, Princess Mononoke, Friends at the Table's Seasons of Hieron. Magic and danger, but with a focus on relationships and unforeseen consequences.