After Gaku Kitada, a talented mathematics scholar, suffers setbacks on his dream of becoming a mathematician, he meets Kai Asakura, a young but similarly talented chef, as he is running his own food business, and joins Kai in an attempt at something new.

Takashi Mikami, a University of Tokyo graduate, joins the Ministry of Education to reform Japan's education but is disillusioned by its reality. Transferred to a private high school, he takes a stand against the authorities, using his role as a teacher to push for change.

When childhood friends Yui and Naoki are by chance reunited as adults, they begin to feel they were destined for each other. However, just as Naoki prepares to propose to Yui, he becomes embroiled in a mysterious incident and dies. Now Naoki's soul wanders the world unable to express his true feelings for Yui. Yuzuru, a detective and the only person who can see Naoki, goes in pursuit of the truth behind Naoki’s death. At Naoki tries to use Yuzuru to talk to Yui, but will he be able to convey his message of love?