Snow White with the Red Hair Vol. 20 (manga)
Shirayuki and Zen are enjoying some rare time off up in Lilias when they spot Obi out and about with an unfamiliar woman. Their curiosity sparked, they decide to play detective and trail Obi! Meanwhile, Mitsuhide and Kiki arrive in Lilias themselves, where Kiki plans to make a full report on how she proposed to Mitsuhide and got rejected!