Sakoo

Yotou is the slash ship between Yokoo and Satou from the Toilet-bound Hanako-kun fandom.

Canon
They are seen together almost all of the time, a pair, that should not be separated. They sit next to each other in class, eat together during lunch, are seen celebrating an Old Man Party during the Three Clock Keepers Arc, study together, come to class together, are in the student committee together, and are generally always together. The only scene I can think of where we see one without the other is during episode 8, or the Mitsuba chapters of volume 4, where Yokoo explains to Kou about Mitsuba. They are almost complete opposites, which can be observed just by even looking at them, Satou's calm demeanor with Yokoo's lively presence makes them a complete whole, creates a balance, and it wouldn't feel right one way or another. Yokoo enjoys the sparks of lightening, while Satou would take of the whole day in fear of it, Satou is skilled at baking, while Yokoo is relatively far worse, and Mitsuba honestly points it out, even pointing it out. They also have their own chapter in the spin off manga After School Hanako Kun, where they go to high school.

Fanon
Most of the fans who acknowledges them are quick to ship it. As they seem close, they would easily be considered as a couple in the fandom.

Fandom
FAN FICTION

Manga
 Yokoo and Satou in Class.jpg