Sumikkogurashi debuted in 2012 as slightly negative characters who like to stay in the corner of a room. The characters include "Shirokuma", a polar bear who is sensitive to cold, "Penguin?" (with a question mark in its name), a penguin who is unsure if it is actually a penguin, "Tonkatsu", a piece of pork cutlet that was left uneaten, "Neko", a shy cat, and "Tokage", who hides his nature as one of the last dinosaurs. The franchise has inspired toys, books, stationery material, video games—and now a feature film.
The Nagahara branch of Tokyo Daiichi Bank is a small branch that mainlydeals with small and medium-sized businesses. Masahiro Nishiki was a deputy manager working there. He was now off the career track but was working peacefully, trusted by his team members and co-workers.
Kazuki Suzumoto is divorced and he lives with his 15-year-old son Kouki. Kouki is in a susceptible time. The father feels guilty about his son. Kouki then fails his high school entrance exam. In the spring of the following year, Kouki barely passes his high school entrance exam. Kouki mentions to Kazuki that he likes his father's lunch box. The father and son make a promise to each other. Kazuki promises that he will make a lunch box everyday for Kouki. Kouki promises that he will never skip school.
