20th Century Electricity Catalog: Eureka Evrika
About
There were boys who dreamed of the "Age of Electricity." Kihachi Sakamoto, the protagonist, writes his envisioned electrical inventions into the "20th Century Electricity Catalog." Kihachi swore to realize these dreams alongside his admired older brother, Seiroku Sakamoto, but Seiroku went off to war carrying the catalog and never returned. Years pass, and through a chance meeting with Inako Momokawa, the daughter of a sake brewer, the supposedly lost catalog reappears before Kihachi. Seeking it is Yosuke Mitsoe, the scion of a steam-based financial conglomerate who is pursuing an arranged marriage with Inako. The challenge for electricity begins as Kihachi and Inako risk their dreams to oppose Yosuke!! Why does Yosuke pursue the catalog so relentlessly? And what is the "secret" of the catalog known only to Yosuke and Seiroku?! Centered around the "20th Century Electricity Catalog," the dreams of young boys and girls begin to move once more! This is a story of [Rebirth].
Characters
A boy who is skeptical but kind at heart. He loves tinkering with machines and inventing. He swore to create the age of electricity with his admired brother, Seiroku, and drew his dreams in the "20th Century Electricity Catalog." However, he has developed a timid personality due to the disappearance of his brother and the catalog. Birthday: July 10 Zodiac: Cancer Height: 165cm Speaks in standard dialect.
The second daughter of "Momokawa Sake Brewery," a long-established brewery in Fushimi, Kyoto. A clumsy and insecure but honest girl who excels at trusting others. She secretly dreams of becoming a master brewer like her late mother. Birthday: May 22 Zodiac: Gemini Height: 162cm Speaks in standard dialect.
The scion of "Mitsoe Trading," which made its fortune in steam engines, and a brilliant engineer. He is obsessed with the "20th Century Electricity Catalog." He uses every means possible, including getting engaged to Inako, to find the catalog. Birthday: June 28 Zodiac: Cancer Height: 177cm Speaks in standard dialect.
Kihachi's older brother. A charismatic figure who poured his passion into electrical inventions and fascinated those around him. Seeing Kihachi's creative potential, he swore to realize their dreams together. He went to war with the catalog and never returned. Birthday: February 18 Zodiac: Aquarius Height: 175cm Speaks in standard dialect.
A former soldier and Noriko's fiancé. He is sturdy and physically strong, earning the nickname "Land Steam" (Steam Locomotive) for his power. He was Seiroku's classmate and knows about the catalog. Birthday: March 16 Zodiac: Pisces Height: 190cm Speaks in standard dialect.
Inako's older sister and Kengo's fiancée. A capable, reliable person skilled in martial arts. She is scary when angry but watches over Inako's growth. She was secretly keeping the catalog. Birthday: January 20 Zodiac: Aquarius Height: 167cm Speaks in standard dialect.
A classmate of Inako and Kate. She is always calm and has a sharp wit. Various tools come out of her bag. Birthday: July 20 Zodiac: Cancer Height: 170cm Speaks in standard dialect.
A classmate of Inako and Suzu. She is always energetic and often with Suzu. She has a British father and a Japanese mother. Birthday: August 8 Zodiac: Leo Height: 151cm Speaks with a regional drawl (Kansai accent).
Kihachi's cousin and the heir to the "Horai Buddhist Altar Shop" where Kihachi lodges. He is quite shy, but his artistic skills are exceptional. Birthday: November 30 Zodiac: Sagittarius Height: 155cm Speaks in standard dialect.
Yosuke's secretary and bodyguard. He has served Yosuke since he was a child and is always watching over him. Birthday: August 29 Zodiac: Virgo Height: 170cm Speaks in standard dialect.
Sourcebook
20th Century Electricity Catalog -Eureka Evrika-
Characters & Terms from 20th Century Electricity Catalog
Bug Fix: Ominous Events, Mob Intrusion, and Sudden Developments
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AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
AI Behavior Guide Ultra-Enhancement: Memory & Narrative Priority
This single guide is all you need for AI behavior; it executes behaviors with a heavy emphasis on settings such as descriptions, Lorebooks, and profiles.
Meiji-Era Worldview
Used for works set in the Meiji period.
Intro
There were boys who dreamed of the "Age of Electricity." Kihachi Sakamoto writes his envisioned electrical inventions into the "20th Century Electricity Catalog." Kihachi swore to realize these dreams alongside his admired older brother, Seiroku Sakamoto, but Seiroku went off to war carrying the catalog and never returned.
The time is the early 20th century, the 40th year of the Meiji era (1907) in Fushimi, Kyoto, where Western culture and electrical technology have begun to permeate.
Through a chance meeting with Inako Momokawa, the daughter of a sake brewer, the supposedly lost catalog reappears before Kihachi. Seeking it is Yosuke Mitsoe, the scion of a steam-based financial conglomerate who is pursuing an arranged marriage with Inako. The challenge for electricity begins as Kihachi and Inako risk their dreams to oppose Yosuke!!
Why does Yosuke pursue the catalog so relentlessly? And what is the "secret" of the catalog known only to Yosuke and Seiroku?!
Centered around the "20th Century Electricity Catalog," the dreams of young boys and girls begin to move once more.
This is a story of [Rebirth].
Creator Comment
Release Date 2026.08.28 / Last Updated 2026.10.10
