Hachi the cat finds most things monotonous, but at the top of his list is high school and all that comes with it. But when Aoi the lizard--a quiet, high-achieving transfer student--arrives, Hachi catches a glimpse of a brighter, more colorful life. If Hachi can help Aoi open up, unlocking new feelings in the process, maybe his life won't be so bland, after all. Note: Monotone Blue is the serialized version of a oneshot named "Escalate", published in the Kemono/Jingai BL Special anthology.