Detective Agency of the Bizarre - Chapter 15: Fifteen. Mrs. Slav’s Sorrow

I was reincarnated into another world, and I’ve brought the Horadric Cube from Diablo II with me.
Being a knight is cool and all, but being a wizard is pretty neat as well.
So, which one will it be?

“Master, Xingchen Zi said his master refined a treasure—a huge boat that flies in Heaven—and only his master knows how to do it. Is that true?”“It's true.” Cao Zhen glanced at the super-large flying peak beneath his feet and nodded.“Master, have you heard? The Jiao dragon on Azure Dragon Peak seems to have the potential to become a Golden Dragon!”“Just scoop up an Azure Dragon from our family's Fengshui pond and play with it. Don't interrupt me while I'm cooking.”“Master, I've heard that...”“No matter what you've heard, go to my room and look around, everything... ah, wait a moment, let your senior sister come out first.”

A side story series featuring the girls of Kyoukai Senjou no Horizon.

As a house servant, Gu An accidentally shattered a jar of Spirit Flowers in his youth, and in his panic, he discovered that he had seized twelve years of life span!A path to immortality thus unfolded before Gu An's eyes!In order to cultivate in peace, Gu An chose to become a Servant Disciple of the Supreme Sect, planting medicinal herbs daily to cultivate by seizing the life span of these herbs.Through the evolution of life span, his Basic Skill constantly evolved, deducing from Basic Sorcery to reach Divine Skills that connected to heaven!Eras changed, constellations shifted, and the Mortal World transformed vastly.Gradually, legends of immortals emerged in the Mortal World.The immortal known as Gu An expended half of his life span, helping his Cultivation Level break through the limits of the Immortal Path and achieving the realm of a Saint, soaring above the heavenly laws.However, one day, a white-robed old man with a saintly presence came to visit Gu An.“I am Xuan Qing from the Heavenly Stars above, appointed by the Heavenly Emperor Tai Hao. Hearing of Daoist Friend's numerous benevolent deeds in the Mortal World and your countless rescues of the living beings here, the merits are immeasurable. Thus, I have been dispatched from the Lower Realm to invite Daoist Friend to join the ranks of the immortals, to take up an immortal office, the Divine Steed Celestial Official.”“May I ask what the duties of the Divine Steed Celestial Official are?”“In the Heavenly Court, there are divine steeds that can traverse earth and heaven and penetrate Yin Yang. The Divine Steed Celestial Official is responsible for looking after and feeding these divine steeds.”Huh? Taking care of horses? Groom?!