Ore wa Mada, Honki wo Dashite Inai

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 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 him to head the house and have him demonstrate his true ability. *Note: Includes a prologue, and six bonus chapters*

Hermes is the fourth son of the Cano family. Although Hermes was said to be the downcast of his family, he was enjoying his life as an aristocrat, but by chance he inherited the family and became the head of the family!! He feared that he would no longer be able to live a leisurely life if he was expected and appreciated. He tries to hide his abilities in every situation, but...!? He is still the "strongest" head of the family, admired and respected by men who don't want him to be serious!