Born as the Thirteenth Prince, Noah was originally in a position removed from the imperial succession, so he freely passed his time in the fief granted to him.... more>>

However, the Crown Prince died before the Emperor. The imperial succession would be fairly contested among the remaining princes.

Noah, being the strongest despite living freely, overwhelmed the other princes and eventually became the Emperor with the most power in the world. <<less

Weird development where the main character, who is the fourth son of a noble household and is called the stain of nobility, has to inherit... more>> the house because his three brothers were conveniently in the same party and all died to a meteorite apparently. The older sister who's left disowns herself and instead registers herself as his foster daughter and now she calls him dad all to get the him to head the house and have him demonstrate his true ability. <<less