Honzuki no Gekokujou: Hannelore no Kizokuin Gonensei

Half a year has passed since Yurgenschmidt inaugurated its first underage aub. Hannelore, now an archduke candidate for the country’s top-ranked duchy, is in the midst of a crisis. Despite her natural indecisiveness, she finds herself pressed to choose from a growing list of marriage candidates. Her father suggests Kenntrips and Rasantark—her childhood friends—but then her half-brother Raufereg throws his hat into the ring. And what about Wilfried, the apple of her eye? Convinced that Liebeskhilfe the Goddess of Binding is toying with the threads of her fate, Hannelore turns to her dear friend Rozemyne for guidance. In the debut volume of this battle fantasy, the divine avatar fights to settle an engagement!

(Source: J-Novel Club)