Name: Ikuru Ichinose Reading: Ichinose Ikuru Date of Birth: March 17, 1996 Gender: Male Blood Type: A Zodiac: Pisces Birthplace: Nakano, Tokyo Occupation: Elementary school teacher Weakness: Extremely unlucky. Details: Iroha's colleague. While he is hardworking and diligent, he has lived a life of misfortune where everything he does backfires. When the soul of Iroha from the Edo period time-slipped into the modern Reiwa era, he happened to be there and ended up looking after her. While being constantly jerked around by Iroha in Iroha Nashiki's body, he finds himself falling in love as he cares for her...!? He lives in a decent apartment. Good-looking.

Name: Iroha Reading: Iroha Date of Birth: April 10, 1663 Gender: Female Blood Type: O Zodiac: Aries Birthplace: Shibuya Village (present-day Shibuya) Status: Daughter of a courier shop owner Weakness: Reckless Details: The only daughter of a courier shop owner living in the mid-Edo period. She has a tomboyish personality and rough speech, but is highly curious and interested in mathematics (wasan). She admires Takakazu Seki, whom she calls Master Seki. She secretly wanted to teach children, but since it was outside the common sense of the time for a young woman to be a teacher, she kept that dream buried. By time-slipping to the Reiwa era, she ends up standing at the podium as Iroha Nashiki. Previous Profile: Name: Iroha Nashiki Reading: Nashiki Iroha Date of Birth: November 25, 1998 Gender: Female Blood Type: AB Zodiac: Sagittarius Birthplace: Fujisawa, Kanagawa Occupation: Elementary school teacher Personality: Quiet and bad at relying on others.

Name: Reiji Majima Reading: Majima Reiji Date of Birth: May 1, 2001 Gender: Male Blood Type: B Zodiac: Taurus Birthplace: Tochigi Prefecture Occupation: Elementary school teacher Weakness: A bit airheaded Details: A rookie teacher. Despite being in his second year, he is blunt and unafraid to speak his mind, possessing the mental strength to brush off complaints from parents and snide remarks from senior teachers. He is rational and proud, but also shows respect and affection toward those he recognizes as worthy of respect as teachers. Good-looking. He seems to be in love with Iroha. Perhaps a bit possessive?

Name: Takakazu Seki Reading: Seki Takakazu Gender: Male Status: Samurai, Mathematician (Wasan scholar) Details: Exhibiting extraordinary talent for mathematics since childhood, he taught himself the subject. While serving as an accountant at Edo Castle, he teaches mathematics to people at an algorithm instruction center. Through their shared interest in math, he deepens his connection with Iroha, coming to highly value her talent and passion, eventually building a deep bond of trust. Despite the class difference between a samurai and a townsperson, he becomes an irreplaceable loved one for Iroha. He is searching for Iroha.

Name: Renji Sano Reading: Sano Renji Gender: Male Weakness: Slightly harsh tone (though gentler with his son). He wears a black cap and mostly black-and-white clothes. He looks a bit rough, but he's a good guy at heart. A modern man who looks exactly like Iroha's Edo-period love, Takakazu Seki. He is a single father raising his son (Naoya Sano, 3rd grade) who attends the elementary school where Iroha works. He works multiple jobs to make ends meet and lives a hard-working life. Because of this, he can't spend much time with his son.