The happy endings are Noah and each of the respective love interests, yes. It is a romance game, so it ends with characters endings up in a relationship if you get the good endings.
In some romance games, the "good endings" are not good at all. This game is dark and I wasn't sure if the happy ending here wasn't just Noe slowly emerging from a dark place. That's why I kept asking 😅 Thank you for the clear answer.