A yandere wife is not on the perfect path?
The adventurer guild's status has risen so high it is comparable to the families behind nine ascended kingdoms. Every guild is different, however!
There are two paths that people aiming to grow up in strength take. It is to become an adventurer or join the noble families.
There are cases where adventurers work with nobles, but it is riskier this way. It naturally depends on the noble family when it comes to the danger and whether it is fine to trust their intel, but most nobles treat the adventurers working for them similarly to the slaves.
Bound by contract, there is no place for trust or amiable feelings that sometimes can change the tides of the battle.
Kyoya naturally wants to grow up in strength, so that the adventurers' life can be lived off to the fullest. It would be different if his wife hadn't given him power such as the All Creation System and snatched him from his world using raw force.