Erwin von Arnim/Relationships

Wendelin von Benno Baumeister
Erwin considers Well his best friend as they both come from similar backgrounds and circumstances. Their relationship is good and can be sometimes stingy if their words contradict. Wendelin on the other hand, is extremely furious and envious of Erwin's upbringing, as he never had any childhood friends especially girls that have love for him.

Haruka Fujibayashi
Erwin became instantly attracted to her, developing extremely strong feelings the first time he saw her. Since they are both acting as bodyguards and are both sword users, he uses those facts as an opportunity to get close to her, but she is unaware that he has any potential feelings for her.

Erwin begins taking swordsmanship lessons from her, finding that he has more talent for Japanese-style samurai swordsmanship than for traditional style. He wishes to ask for Haruka to be his wife, but her brother Takeomi attempts to intervene. After Wendelin defeats Takeomi in a duel, he explains to her that Erwin wishes to marry her and she accepts the proposal.

Following their engagement, they spend a significant amount of their free time getting close, and their relationship blossoms. She continues to instruct him in samurai swordsmanship. The two stay with each other nearly all the time, fighting side-by--side.

Leah
Erwin didn't really think much of her back then, but Leah, however, was attracted to him at first sight. She sometimes has fantasies of having dates with him and would get spanked a lot by her cousin, Baumeister Earldom's head maid, Dominique. Erwin was urged by Haruka take her as his wife, which took Leah by surprise, with immense happiness. Alongside Anna, they safely got engaged.

Anna
He and Anna are childhood friends, and a dilemma in the Arnim Knightdom made her escape and go straight to the Baumeister Mansion, to meet Erw and possibly get married to him. It was revealed as since he was neglected for being the 5th son, she was the only one who could relate and communicate with him. It is shown she has feelings for him since the first place she went to away from the Arnim Knightdom was to go to Wend's to see Erw. When she got rejected and given the choice to return back home, she was absolutely dejected and was weeping. Also, when Erw decided to take her as a wife, she leapt unto his arms, crying her eyes out. She officially gets safely engaged to Erwin alongside Leah on the same day of her arrival.