World's Least Interesting Master Swordsman

Master Suiboku's given Sansui his blessing, so in addition to guarding his mistress, Lady Douve, he's now offering instruction in swordsmanship. Not only is he teaching his fellow Japanese transferee Saiga and the foreign prince Tahlan, but he's somehow found himself teaching the city's ne'er-do-wells and the Royal Guard. Meanwhile, House Caputo, a Great House of the Arcana Kingdom, is fighting a war with the Kingdom's neighboring nation. Evidently, the army invading the Caputo lands is equipped with cheat items, but House Caputo's got a cheat of their own up their sleeve.

"I've spent three thousand years preparing to kill you--" Fukei has plunged the Kingdom into darkness using storm clouds under his command. An Immortal who has spent millennia training to defeat Suiboku, Fukei commands the heavens and earth and is nigh unkillable due to his Immortal Arts. Even wielding the power of the Legendary Sword Eckesachs, Saiga can do little against this overwhelming force. As Fukei threatens to destroy the Arcana Kingdom, Suiboku returns to the mortal world after thousands of years to save his apprentice's students and to apologize to Fukei. Apprentices who trained as brothers now face off, marshaling centuries of skill and power in a tragic and bitter fight to the death.

With the strongest swordsman around, the kingdom of Sepaeda has nothing to fear. If his master wills retribution, then he will deliver it. Douve and Tahlan, Happine and Saiga, Setenve and Ukyou... All three couples are set to have a beautiful wedding ceremony together. And thanks to the otherworldly arrivals, Arcana has been developing by leaps and bounds. This rapid growth, however, has its neighboring nations on edge. They're afraid, awestruck, anxious, and above all, envious. Blinded by jealousy, they insult Tahlan personally. Sepaeda's young leader immediately leaps to his defense-and he has no plans to keep things civil!