Ore no Sora

Yasuda Ippei is the heir to the wealthy Yasuda Family, and a bright and talented student who is admired by all. On his 18th birthday, he is sent on a year-long journey in which he is guaranteed complete and utter freedom. However, unless he returns by the end of the year with a bride the entire family approves of, he will be disinherited.

(Source: Mangadex)