Most satisfying happy endings in otome?

Nicola's good ending in 1926!! That entire route and ending felt like an actual canon yk, like if the game had to be adapted into like a movie or anime, that route would be very very satisfying!

Also, while bittersweet, I'd say Hajime's good ending in Hakuoki too. I loved the slow burn and the ending felt like. Omg yes finally!

I really liked the happy ending of 《Steam Prison》
Every character had a good ending (not a romantic one with the female lead). They resolved misunderstandings, worked together to face problems, shook hands, made peace, and worked together to improve the situation and plan for the future.

Originally, the people of heaven and earth disliked each other, each developing their own unique culture, let alone cooperating. The female lead acted as a bridge, helping both sides to improve.

《Steam prison 》大團圓結局，我很喜歡
每位角色都有各自好的發展（不是跟女主戀愛結局）化解誤會，同心協力面對問題，握手言和，攜手努力改善，規劃未來。
原本天上、地上人民互看不順眼，各自發展獨特文化，更別談合作。女主角就像一座橋樑，協助2邊越來越好。

Probably Allan from Cupid Parasite? after all they went through in the past it was nice to finally see them happily together.