My Neighbor Seki-kun and Rumi-Chan's Jisho

Seki-Kun, he always has something on his desk. He manages to play some not very elaborate games, without attracting the teacher's attention. From Dominoes, to Shogi, robots, playing with cats and more, he always has something new to do. Yokoi sits next to him and is always interested in his games, although she is the one who ends up getting into trouble with the teacher.