Tonari no Seki-kun: The Master of Killing Time Episode 21

All Rumi Yokoi wants to do is focus during school, but she is constantly distracted by Toshinari Seki, her neighboring classmate. Paying attention during class is the least of Seki's worries, as he obsesses over intricate setups created using an assortment of items, from an elaborate domino course on his desk to a treacherous war played out with shogi pieces. Yokoi desperately attempts to focus in