 If you liked
Boukensha License wo Hakudatsu sareta Ossan dakedo, Manamusume ga Dekita node Nonbiri Jinsei wo Ouka suru
|
 ...then you might like
Senken no Majutsushi to Yobareta Kenshi
|
In both manga, the main lead live in a medieval era in Europa but with swords and sorcery where the mc ends up becoming parent like figure for a child (in Boukensha License ...) and for a young twins (in Senken no Mjutsushi...). The characters' actions are fairly realistic and the atmosphere gets heavy and become dramatic quite often (with a lot of emotions thrown at the reader).