Twenty-one-year-old Hana is a curious young woman raised to assume control of her family's magical pawnshop in Tokyo. Her skin is tattooed with a blue map charting her predetermined future, leaving her feeling restricted by her obligations. Although she longs for freedom and exploration, she feels deeply bound to her familial duties and the strict rules governing her magical world.

Keishin is a young physicist from the non-magical world who accidentally discovers Hana's pawnshop. Struggling with feelings of abandonment from his childhood, he frequently relies on the imagined voice of his late mentor for rational guidance. He finds himself drawn to Hana, preferring the wonder of her environment over the predictable science of his own life.

The Shiikuin are pale, masked creatures with talons who administer justice in Hana's magical world. They track rule-breakers by the scent of their secrets and are feared by all residents for their cruel and absolute punishments.

Toshio is Hana's father and the proprietor of the magical pawnshop. He has spent decades rigidly adhering to his world's laws, collecting regrets from human clients and keeping them safely caged as glowing birds. His sudden disappearance from the shop sets the central mystery in motion.

Chiyo is Hana's mother, who was exiled when Hana was an infant for stealing a choice from the pawnshop vault. Remembered differently by her husband and daughter, her legacy casts a long shadow over the family and dictates many of the restrictive rules Hana must now follow.

Izumi is Toshio's final client who runs a local flower shop and is married to a man named Yoshi. She is haunted by decisions she made in her youth and trades her regret to Toshio in exchange for peace of mind. Her transaction leaves behind a brilliant blue bird that emits remarkable light.

Haruto is Hana's childhood friend and betrothed partner. He is a gentle artisan who assists Hana and Keishin by manipulating time using specialized artifacts. He accepts his fated relationship with Hana while harboring genuine care for her well-being.

Ramesh is Keishin's former physics professor and mentor who died after being attacked by a mugger. Though deceased, he exists as a voice in Keishin's mind, offering the young scientist rational advice and emotional guidance during uncertain moments.

Junichiro is Izumi's former lover from decades past. Izumi visits the ramen restaurant to hold onto her memories of him before eventually deciding to trade those memories to the pawnshop.

Yoshi is Izumi's current husband in the non-magical world. He lives a quiet, mundane life with her while she secretly harbors regrets and memories of a past romance.

Masako is Haruto's mother, residing in the Valley of Stars. She is highly protective of her son and deeply involved in the complex, fateful history connecting her family to Hana's.

Fumiko is a lifelong friend of Hana's family who raises her late sister's children. She paints stars representing people's hopes and understands the heavy burden of longing.

Sobo is Hana's grandmother who runs a midnight teahouse in the magical realm. She possesses deep knowledge of the past, including the details surrounding Chiyo's trial and exile.

The Horishi is a famous, magical tattoo artist in Hana's world. He determines and inks the fates of children onto their bodies in the form of elaborate blue maps, dictating their life paths.

Natsuki is a vendor at the subterranean Night Market who trades valuable information for precious, happy memories. He wagers his knowledge in a high-stakes dice game against Keishin.

Hiroko manages knowledge in the Library of the Lost. She harbors dark, historical memories about the origins of their world and guards the location of a subterranean field.

Liz is Keishin's former neighbor in the non-magical world. During an emergency where their elevator stalled, she went into labor, forcing Keishin to help deliver her baby.