Anime that have appeared from chapter 21-40 include these, in not particular order:

Fairy tail

Death note

D. Gray man

Akame ga kill

Full metal alchemist

Digimon

Akatsuki no yona

Date a live

Naruto

Strike the blood

Black butler

Is it wrong to pick up girls in a dungeon (Orario is the place where the anime takes place)

Overlord

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Blue exorcist

Hellsing

Tokyo ghoul

Higurashi no cano

Bleach

The sacred blacksmith

Kill la kill

Lord marksman and vandis

Unlimited fafnir

Chivalry of a failed knight

Dragonar academy

Dragon ball Z

One punch man

Bladedance of elementalers

Assassination classroom