Adult PC Game: Okyu Kishi Erisu no Netorare Monogatari Ver. 1.01 by Aruka (Jap) Archive

Eris, a royal knight in the service of the Kingdom of Albus, receives a mission from the princess.

She is asked to investigate a disturbing rumor circulating in the frontier town of Sly.

Ellis has a guyfriend, Yuki, a pastor and friend, and they have promised to get married after this mission.

She is looking forward to getting married to Yuki, but there are men with various agendas on her way to the mission...