Juna Doma/Relationships

Excel Walter
Excel is Juna's grandmother. At first, it's revealed that Juna was a spy named Canaria working for Excel to see whether or not Kazuya could be trusted. As the story progresses, they're shown to have a mother-daughter bond (despite being grandmother and granddaughter) as Excel would encourage Juna to pop the question towards Kazuya instead of giving up her reward for her grandmother.

Kazuya Souma
At first, Juna was only ordered to get close to Kazuya in order to determine if he can be trusted as the new king, but after seeing his realist look on things for the kingdom, she decided to remain loyal to him. When Kazuya started to overburdened himself after returning from the God-Protected Forest, she comforted him (after being asked by Liscia) by singing him a lullaby so that he would sleep. Her comfort lead to Kazuya crying himself to sleep, and after seeing this, Juna swore that if Liscia was the one that brought out the strength in him then she would be the one to hide his weakness. After returning from the Principality of Amidonia, her feelings for Kazuya were shown as when Kazuya asked her what she wants for a reward she popped the question (due to encouragement from Excel). Kazuya postponed it until the Lorelei project was finished as when it did, they would later get married.

Liscia Elfrieden
Their relationship at first that of a princess and servant. After Kazuya overburdens himself, they bond over their affection for him and become close like sisters. Later on, Kazuya would marry Juna which in return makes her and Liscia sisters-in-law.