The first episode of this series of shorts features Yokoi (voiced by Kanazawa Hana) watching in despair as Seki plays dominoes with loads of his erasers in the middle of class.
There’s not really much to say about this series since it is incredibly high concept. The fact that Hanakana was cast as the main character here says that it was mainly about getting someone who sounds excited easily. Basically, all it comes down to is a series of segments of Hanakana playing William Shatner in that famous Twilight Zone episode where there was a monster on the wing of the plane. Except that it is a boy with a little too much time on his hands in class and an endless supply of equipment.
On the plus side, I did like the ending theme. It’s the 2nd best one I’ve seen so far (first being a show that hasn’t officially aired yet.)
Lower Mid-Table 
So this is what you were talking about (yes it took me 26 days to read this post.) I never saw the original Shatner episode of this but they retold this story in the 1983 Twilight Zone movie.