Death March to the Parallel World Rhapsody, Vol. 18 (light novel) — Hiro Ainana

After dispatching the monsters laying siege to the royal capital and aiding in the bloom of the Royal Sakura blossoms, Satou and his party are finally able to welcome the New Year. Our sightseeing adventurers spend a healthy chunk of time indulging in rare delicacies, bolstering their combat abilities, meeting up with old friends, and dealing in unique and powerful items! Even more exciting than welcoming the New Year with ample festivities, though, is the auction surrounding the Prayer Ring! If Satou plays his cards right, he might just be able to free Arisa and the others from their servant status! What better use for his near-limitless wealth?