

Tonari no Seki-kun: The Master of Killing Time
In the middle of class at a certain school, Rumi Yokoi, a diligent student, has her in-class life turned upside down when her desk mate Toshinari Seki begins to play by himself at his desk in class. Although Rumi is irked by Toshinari's distracting yet intricate playtime, she finds herself being drawn into his interesting hobby. Never being able to focus, Rumi observes Seki's stunning ways of slacking off in class.
Seasons
You may like

Adventures of Sonic the Hedgehog

El Chavo del Ocho

Read or Die the TV

Legend of the Galactic Heroes

The Legend of Heroes: Trails of Cold Steel - Northern War

The Ancient Magus' Bride: The Boy from the West and the Knight of the Blue Storm

Let's Nupu Nupu

Equalizer

Mobile Suit Gundam: The Origin - Advent of the Red Comet

Omotesando Koukou Gasshoubu

Mottainai Grandma

Papuwa

Student Council's Discretion

Theatre of Darkness: Yamishibai

NANA

Back Street Girls: Gokudols

Charge! Men's Private School

Are You Lost?

Vinland Saga

If It's for My Daughter, I'd Even Defeat a Demon Lord

Aharen-san wa Hakarenai

Lucky Star

Akebi's Sailor Uniform

Minami-ke
Tonari no Seki-kun: The Master of Killing Time · S1:E1