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Najimi Ajimu is the founder of Hakoniwa Academy and the creator of the Flask Plan. Ajimu has been absent for three years after being sealed by Kumagawa. After Medaka's success in reforming Kumagawa, the seal has weakened, whereupon Ajimu is set loose. Ajimu possesses a total of nearly thirteen quadrillion skills, and is the embodiment of seven hundred million Not Equals. Ajimu views humans with as much disdain as eraser shavings, and has trouble distinguishing people from the environment. Ajimu uses Zenkichi in an attempt to have him defeat Medaka and usurp her position as the "main character". It is ultimately revealed that her goal was to find something impossible, and as such she initiated the Flask Plan with the intention of failing. After Zenkishi succeeds in defeating Medaka in the election, Ajimu attempts to commit suicide, but is stopped by Medaka, who correctly concludes that her true problem lies in simulated reality, and being extremely weary of life. Ajimu is enrolled as a first year student, is reformed, and gradually starts to care for and be more loyal towards other people. She is later killed by Iihiko when buying time for her friends to escape. With Iihiko's defeat, it is believed she will eventually return.

Main Article: Najimi Ajimu

This picture displays Medaka Kurokami, Hansode Shiranui, Kamome Tsurubami, Kouki Akune, Misogi Kumagawa, Mogana Kikaijima, Namanie Nienami, and Zenkichi Hitoyoshi having their photo taken at Hakoniwa Academy's graduation ceremony. The one taking the photo, Royal Hirado, asks them what one plus one is. Everyone in the group answers two (which is written as smile). This scene marks the finale of the Unknown Shiranui Arc.

"No. Medaka-chan, I won't go with you."

- Zenkichi Hitoyoshi's answer to Medaka Kurokami's offer to leave the school with her in Chapter 186