The fourth season of Future Card Buddyfight.

After falling asleep while playing an online game, a man wakes up and finds himself transported to that game's world as his in-game character, Arc. He wastes no time adjusting to his new environment, but soon realizes that he is using the skeleton avatar he chose when creating his character, which forces him to hide his visage to avoid unwanted attention. Arc goes to the nearby castle town of Luvierte, hoping to become an adventurer and take on quests to earn money. With his overpowered abilities, Arc embarks on a fantastical journey—exploring diverse territories, looting various monsters, and helping people get out of sticky situations. However, his seemingly innocuous actions may soon involve him in a brewing large-scale conflict that will forever alter the fate of the realm.

Third season of Future Card Buddyfight.

In a fictional school, Tender Tank Rareko is constantly opening absurd yet strangely enthusiastic debates, this way creating a lively classroom life. Bringing up tremendous themes, she and her classmates exchange words like sword-strokes, and here and there even a profound remark is slipped in. A fun and informative debate comedy, packed into only five minutes each time. (Source: AniDB)