Rocker-Kun

"Rocker-Kun" is one of the many inventions made by Ueno. It made it's debut in the first episode of "Ueno-San Wa Bukiyou."

History
Rocker-Kun was initially made by Ueno to purify her urine so that Tanaka can drink it. Tanaka refused, though it is unknown whether Tanaka did consume some of the substance or not as Ueno states, when Tanaka leaves, that she will slip some of the substance in his lunch.

Design
Rocker-Kun appears to be a short hexagon shaped stick with a small tube sticking out the bottom. The word "Mouth" is engraved on the side of the device in Japanese with a teal color.