Waking up in a strange new place with no memory of his past life, Kelvin learns that he's bartered away those very memories in exchange for powerful new abilities during his recent transmigration. Heading out into a whole new world as a Summoner—with his first Follower being the very goddess who brought him over!—Kelvin begins his new life as an adventurer, and it isn't long before he discovers his hidden disposition as a battle junkie. 

Following his transmigration, during which he bartered away his memories in exchange for rare and powerful skills, Kelvin is fully enjoying his new life as an adventurer. After making a name for himself in Parth, becoming the city's most famous and respected adventurer along with his close-knit motley crew, he next sets his sights on Toraj, the Country of Water. But what should have been a peaceful visit to satiate his heartfelt cry of "I haven't had a grain of rice since arriving in this world—I want some rice!!" was, of course, never fated to go smoothly.

As Kelvin, the battle junkie Summoner hailing from another world, continues his extraordinary exploits, Goddess Melfina finally returns to his side, finally having completed her artificial body. When she grants him her blessing, he gains the power to summon a Hero of his own . . . who wants to become his stepsister?! As Kelvin and his party grow stronger by the day, he receives a summons for his Rank S promotion exam. The contents of the exam involve saving an elven settlement from the threat of a terrible monster, but just how much is the militaristic nation of Trycen involved?

After having fulfilled the requirements for his promotion to Rank S, Kelvin, the eccentric Summoner who transmigrated from another world, finds that a series of festivities are being prepared in his honor. To his surprise and delight, he learns that part of it involves a one-on-one practice round with Silvia, a Rank S adventurer nicknamed "Ice Princess." Eagerly anticipating this match against a truly worthy opponent, he promptly dives into his training like never before.

Shortly after Kelvin's promotion to the coveted position of Rank S adventurer, the militaristic country of Trycen declared war on the entire Eastern Continent. In addition to launching an invasion of its neighboring countries, their infamous Dragon Knight Order is now closing in on Parth, led by Crown Prince Azgrad himself. The only thing standing between this dreadful host of warriors and ancient dragons—exceptionally powerful members of their mighty race—and the City of Peace is the Summoner's determined companions and allies.

Kelvin, the battle junkie Summoner from another world, continues searching for powerful opponents even after becoming a Rank S adventurer and defeating the Demon Lord. He receives an invitation to Gaun, the Country of Beastkin, where two things are about to happen: a Naming Ceremony for him as a Rank S adventurer and the Beast King Festival. The former is good and all, but what really gets his blood pumping is the latter, which turns out to be a tournament hosted at the Gaun Mixed Fighting Arena, where all the greatest fighters from across the continent are expected to show up!

Kelvin, the battle junkie Summoner from another world, finally clashes with Leonhart Gaun, the king of the host country of the Beast King Festival. They bring all their strength, wits, and cunning to bear, each struggling to gain dominance over the other and proceed further in the tournament. As the same time, the organization who pulled the strings behind the Demon Lord incident and manipulated Trycen into declaring war on the rest of the continent seems to be on the move. Will this entity shrouded in mystery appear before Kelvin and his companions once again?

After encountering Ange in Gaun, the Country of Beastkin and learning of the existence of the Apostles, Kelvin, the battle junkie Summoner from another world, and his companions decide to visit the Holy Empire of Deramis. There, they are granted an audience with Pope Philip, who offers them information on Iris, the alleged leader of the Apostles, and Serge, a Hero from lore. Just then, the famous Heroes of the current age happen to return from their own journey to the Western Continent.

Our favorite battle junkie charges headlong into hell, chasing the greatest Hero in history! After Kelvin's party defeats Estoria, one of the Apostles, another immediately appears before them. And who is it but Serge Flore, the previous Hero who once defeated Demon Lord Gustav! Even Melfina...

Our favorite battle junkie (Kelvin) clashes with the previous Demon Lord (Gustav) in the depths of hell where no light reaches! Upon chasing Serge Flore, one of the Apostles, all the way to Abyssland, Kelvin catches wind of a strange rumor. Namely, the ghost of the previous Demon Lord, Gustav...

Even after Kelvin has defeated Gustav in battle, Sera and Bell's sisterly fight rages on. The two seem equally matched, but once they have revealed all their moves and it seems the end is in sight, an unexpected development occurs! Not long after, Kelvin's party arrives at the home base of the...

The battle junkie finally faces the First Seat of the Apostles at the Sanctuary! Kelvin's party and allies find themselves scattered once they reach their destination. While wandering around, Gerard finally encounters his fated enemy, the man who drove his home country to ruin and death: Jildora!...

The climactic battle in Abyssland has finally concluded and our favorite battle junkie, Kelvin, has a new archenemy: DarkMel, the new Goddess of Reincarnation. To defeat her, the party will have to get stronger! Right now, the gang's path to power lies in the Dragon King's blessings. Though some...

At last, the final confrontation is upon us. Having finished their preparations, Kelvin's force musters in Toraj before setting out to take on what could be the final boss! With help from each nation and all the Dragon Kings in tow, Kelvin seems to stand a decent chance with his plan to take...