Seventeen-year-old Hajime Nagumo is your average, everyday otaku. However, his simple life of pulling all-nighters and sleeping in school is suddenly turned upside down when he, along with the rest of his class, is summoned to a fantasy world! They're treated like heroes and tasked with the duty of saving the human race from utter extinction. But what should have been any otaku's wet dream quickly turns into Hajime's nightmare. While the rest of his class are blessed with godlike powers, Hajime's job, Synergist, only has a single transmutation skill. Ridiculed and bullied by his classmates for being weak, he soon finds himself in despair. Will he be able to survive in this dangerous world of monsters and demons with only a glorified blacksmith's level of strength?

[Source: J-Novel Club]

Unaired shorts included in the second and third Blu-ray releases of the TV anime.

Transported to another world and left behind by his former friends, Hajime had to make his rise from literal rock bottom. It was in the labyrinth where he strengthened his weak magic and found several beautiful allies.

Now after saving his classmates, he ventures for Erisen to escort Myu and her mother. He’ll fight and defeat anyone he has to in order to find a way home—including a god!

[Source: Funimation]

Unaired episode included in the first Arifureta: From Commonplace to World's Strongest Season 2 Blu-ray release.

After the capture, Hajime was worried about the farewell to Miu that would occur when the trip resumed.
Hajime and his friends were talking about "The Seven Great Legends of Elysen" as a memory before they left for the trip, but all of them were missed.
However, in the final seventh adventure, he encounters a mysterious giant creature and is blown into the world of a devastated city!
Hajime, who started to search for the stray Mew, fulfills a miraculous encounter there.

[Source: official website via MyAnimeList]