An unseen evil lurks in the streets of Paris. Unless something is done, the darkness will unleash its destruction and consume all that is good. The City of Love will be lost to her people forever. All hope rests within the hearts of five young ladies. The only problem is, they don't even know it yet. But will an apprenticed nun, a reserved aristocrat, a hardened criminal, a traveling circus emcee and a Japanese girl experiencing loss set aside their unique differences and come together as one for the defense of many. The Paris Fighting Troup is born.

Echizen, who is a modest woman, works at a fish cake plant. Instead of keeping a diary, she draws cartoons of "Nakuna, Harachan" on her notebook about her daily life. The main character in her comic, Hara then appears in the real world.

A soon-to-be-graduating girls, in high school, find out that their homeroom teacher is terminally ill. He writes each of them inexplicit letters. While they encounter various difficulties in their senior year those letters will help them to resolves their personal issues and grow to be better persons and friends.

Nao Takanashi loves her brother Shūsuke despite the incest taboo. Nao thinks that Shūsuke is her blood relative, but in fact she is an adopted daughter, whose parents have died. After Nao learns the fact, she wants to fall in love normally with Shūsuke because siblings by adoption can marry under the family law in Japan. However, she finds herself competing with Shūsuke's childhood friend, Iroha Tsuchiura, and his class president and yaoi lover, Mayuka Kondō.