RIKITAKE

Description from MU: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 the him to head the house and have him demonstrate his true ability.

Aino the Hero and Iro the Mage. After defeating the Demon King, the two women embark on a journey around the world to fulfill a promise they made long ago. This is their story after the end credits roll—the greatest adventure dedicated to each other. A heartrending, radiant road trip fantasy.