Mushoku Tensei: Jobless Reincarnation (Manga) Vol. 19

Rudeus and Sylphiette are enjoying a romantic newlywed life together when Rudeus's younger sisters, Norn and Aisha, suddenly arrive from abroad. Another unexpected reunion quickly follows--their bodyguard for the trip was none other than Ruijerd, Rudeus's old adventuring partner! While Rudeus has faced down monsters, dragons, and the curriculum of the University of Magic, none of that prepared him for dealing with a pair of sisters who couldn't be more unlike each other, not to mention Ruijerd's mixed feelings about his marriage...