Observation Records of My Wife (Light Novel), Vol. 3

Having safely returned home after attending a wedding in the Kingdom of Seahealby, Bertia and Cecil find themselves surrounded by more and more happy news—friends’ weddings, celebrations, and an unmistakably festive mood.
Then one day, Bertia’s contracted spirit Kuro and Cecil’s contracted spirit Zeno decide it’s time to pay their formal greetings… in the Spirit Realm, at each other’s family homes. And since they’re going anyway, Bertia and Cecil tag along.
Their first stop is Kuro’s home: the castle of the King of Darkness. But things take an unexpected turn when Zeno and Cecil are kicked out of the castle and ordered to “work together and clear the trial.”
To reunite with the ones they love, the guys set off—no backing down, no excuses, and absolutely no turning back!