I've turned into a bishoujo, but I chose to be a net-game addict!
The story follows the high school student Jintarou Futsu, whose confession was rejected by his crush. His misfortune continues, as news of a gender-change disease turns Jintarou into a beautiful silver haired girl. The shock of it causes him to try to escape from reality by playing the VRMMO, Clan/Clan... His game character uses the same girl appearance as in real life, and the Alchemy skill, which most players call a trash skill. He meets lots of fellow adventurers, and becomes stronger within the game world of Clan/Clan's slogan, "When one becomes an adventurer, they can fight, steal, control, explore, invent, create, and do anything as they like." He meets a wide variety of adventurers that help him grow, while hiding what happened to his appearance as a bug to his friends who also play the game, and hides the fact that he had become a girl in real life. When summer break is over, he will have to show his face at school. This is about one of the best National-class adventurers, the story of the Alchemist who won a war without even taking a single step. When a normal high school student suddenly turns into a beautiful girl, what would they do? The answer is to that is to become a net-game addict! (Source: Shousetsuka ni Narou, translated)
Yu-Gi-Oh! Official Card Game Structures
Shouma, a new kid who moved to Tokyo with his sister, learns how to make friends through Dueling and creating Structure Decks. (Source: Yu-Gi-Oh! Wikia)
Darkness Of Mahjong Fighter Mamiya
Japan has entered a new era called "Reiwa," after moving past the Hesei Era on April 30th 2019. It is in this era, past the time of people like the legendary Shigeru Akagi and others like him who gambled on mahjong for a living, that a new gambler has arisen known only as "Yami-ma no Mamiya." (Source: MangaDex)
Getter Robot High
A mysterious monster called the High Beast has taken control of the regions of Eurasia and Africa. Japan has cut off from the mainland to protect itself from this threat. The daughter of a legendary mahjong player discovers that monsters attack whenever a mahjong piece is hit across the board. This allows humans to be separated from the battle and for mahjong players to effectively combat the monsters with robots controlled through mahjong moves. (Source: Getter Robo Wiki)
Deokure Tamer no Sono Higurashi
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Cardfight!! Vanguard G: Stride Generation
One day, Chrono Shindou finds a Vanguard deck in his locker at school. With a never before seen clan called "Gear Chronicle," the gears of his fate begin to move. (Source: Bushiroad, translated)
Another Vanguard: Star Road Asuka
Hot-blooded highschool girl Asuka Matsumoto struggles as the manager of a card shop in place of her father. Even so, aiming for Asuka's special cards are the assassins of the card gang "Crown" who will attack one after another. (Source: Bushiroad Media, translated)
Overlord: The Undead King Oh!
A compilation of non-canon short stories that revolve around the interactions between the members of the Great Tomb of Nazarick.
Cardfight!! Vanguard Side Story: Swordsman of Light
The story focuses around the Royal Paladin units, and the first arc that started alongside this game. With a shadow approaching United Sanctuary, the proud swordsmen will be able to protect the kingdom!?
The 1980's was an unusual decade. The price of land skyrocketed, and the value of money went well above the norm. The numbers that defined the world all spun out of control, launching one of the largest bubble economies Japan had ever seen. For Mahjong, as well, it was an age that saw high stakes games on a scale unlike any age before it. And in this age, a man some call "Kai" lives as a "Mukoubuchi," what true, lone-wolf gamblers are called. (Source: Batoto)
Gambling. Mahjong. Death. These are the themes of this fast-paced, undercover-agent-style manga where outrageous life-or-death gambles are made daily occurrences and insurmountable odds are overcome. The most hardcore, action-packed mahjong manga you will ever see. (Source: MU) Nana-chan Scramble (Nana the Scramble Girl)
Not a lot of people know that one of the most talented and ruthless Mahjong players in the city is a young high school boy. Kei is a teenager of few words, but his observation skills, unwavering will and experience in the game allows him to survive in a world full of powerful, rich and dangerous characters. Kei is currently hiding a girl named Amina who has entered the country illegally and protecting her from being deported. He spends his days sleeping through class and his nights playing high stakes Mahjong, waiting for when a worthy opponent arrives. (Source: MangaHelpers)
That place is a den of sin in which money and lives are bet. Ai, a faint-hearted and quiet girl sunk in debt at the brothel Maidens, meets a formerly wealthy girl, Mei. If you lose the bet, it costs you your virginity? Set in a combined casino-brothel, the sexy but cute Mei will end up doing it tonight as well. (Source: MU)
Muteki No Hito
The story features the characters Mizuki Murata, who lost his emotions in a car accident, but in return gained an extremely good memory, and his rival Junpei Sonokawa.