Nanahoshi

Biodata

Feature	Details
Name	Nanahoshi Shizuka (七星)
Alias(es)	Sister Nanahoshi; Professor Nanahoshi; “Black Mom”
Species/Race	Human otherworlder from Japan; later transformed into Dragonkin 170 258
Gender	Female
Affiliation	Magic University laboratory; Rudeus Greyrat’s research circle; Greyrat household 91 273
Occupation/Role	Teleportation-circle and potion researcher; magic-tool maker; Magic University professor 80 267
Status	Alive; expecting Rudeus Greyrat’s child 320
First Appearance	Chapter 65, “Sudden Friend”

Background / History

Otherworlder and teleportation research

Nanahoshi is a Japanese girl transported to the Six-Faced World with her physical body. Because of this, she initially cannot use magic or infuse mana herself. Her foremost goal is returning to Japan, leading her to obsessively study teleportation circles despite the limitation. 170 67

When she meets Rudeus, she is relieved to find another person from Earth. Rudeus agrees to aid her research, asking only that she greet his mother if Nanahoshi ever returns home. 65 Nanahoshi’s technical drawings are highly complex, though some of her early circles fail because their linked components do not properly connect. Aisha identifies the flaw and becomes Nanahoshi’s research partner. 80

Nanahoshi later concludes that she cannot immediately return merely by completing a circle: she believes another person must be transported to the world first. To survive the wait, she begins designing a mana-powered hibernation pod. 124

Previous timeline

In a prior timeline, Nanahoshi forms an uneasy alliance with a far harsher Rudeus. She offers information on Orsted and helps fund and arrange Rudeus’s attempts to cure Zenith, including purchasing test subjects for his brain-invading magic experiments. 170 171

Although initially afraid of him, Nanahoshi attempts to build a friendship through their shared Earth origin. She also challenges Rudeus over his treatment of Aisha and his increasingly uncontrolled experimentation. 171 174 149 Over time, the two develop a close but unspoken physical relationship while collaborating on a mana-storage device and time magic. 177 178

Before Rudeus’s failed attempt to kill Orsted, Nanahoshi assists with his preparations and hides at his request. Orsted later finds the research notes for their time-magic and mana-storage work. 178

Dragonkin research

Nanahoshi eventually becomes Dragonkin through a potion. The transformation allows her to use mana, which greatly expands her ability to create and test magic tools. 184 208

Her long-term potion research shifts toward extending Rudeus’s lifespan. After reorganizing years of data, she realizes that using her own Dragonkin blood as a sample is insufficient; she requires blood from true dragons of many species. 221 258 Rudeus agrees to accompany her on dragon-hunting expeditions, and Lara later helps guide the search for a legendary dragon. 258 262

Nanahoshi ultimately bargains with the World-Gazing Dragon, Ilsarion. In exchange for allowing it to view her and Rudeus’s memories and an unrealized future, she receives far more dragon blood than requested—enough to potentially extend the lives of Rudeus’s family and some descendants severalfold. 263 270

Alternate futures and life on Earth

Through Ilsarion’s transaction, Nanahoshi sees an alternate Earth life in which she meets Chinese traveler Lu Yang at sixteen. Their chance encounter becomes a long-distance relationship, then cohabitation in Japan, discussions of marriage, and a trip to China to meet his family. 264 265 266

The visions also show a different future in which Nanahoshi returns only after Rudeus’s death, places a black ring on his hand to claim the status of his wife, and spends decades continuing her search for Ilsarion. 267 268

Relationship with Rudeus

After witnessing the future where Nanahoshi never abandons her search after Rudeus’s death, both are forced to confront the depth of their attachment. Nanahoshi admits that she no longer knows where she belongs and asks Rudeus to help her pursue happiness. 270 272

They confess their feelings, kiss, and return to the Greyrat home together as lovers. Nanahoshi initially asks Rudeus not to publicly announce their relationship because she is not accustomed to the family seeing her as his partner. 272 273 She gradually becomes fully integrated into the household, is recognized as Rudeus’s fifth wife, and later confirms that she is pregnant. 302 320

Appearance

Nanahoshi is a black-haired, black-eyed woman whose long hair is often left loose or pinned up while working. Her Dragonkin transformation alters her physiology, though no distinct visible Dragonkin traits are described. 267 272 280

• Long, smooth black hair 149 281
• Black eyes 272
• Usually associated with laboratory documents, magic circles, and magic tools 253 258

Personality

Nanahoshi is direct, impatient, and intensely focused on research. She openly criticizes people who ignore the potential of magic and is willing to demand Rudeus’s assistance without softening the request. 65 258 She describes herself as selfish, yet her major research projects repeatedly center on helping Rudeus, from lifespan extension to acquiring dragon blood. 258

She often masks care with sarcasm or bluntness. Nanahoshi can immediately recognize when Rudeus is troubled, warns him when his behavior toward Aisha becomes unhealthy, and urges him to take breaks from destructive experimentation. 149 174 221 Her comfort around Rudeus is so instinctive that they can anticipate each other’s needs without finishing sentences. 253 255

Despite her outward composure, Nanahoshi struggles with loneliness and uncertainty over where she belongs. The Greyrat family’s invitation to visit more often gives her a sense of acceptance, while her eventual relationship with Rudeus gives her a new personal goal: living happily. 222 272

Abilities & Skills

Teleportation-circle research

Nanahoshi specializes in studying teleportation magic and its potential to return an otherworlder to Earth.

• Produces detailed teleportation-circle blueprints despite initially being unable to supply mana herself. 67 80
• Understands the importance of linked circle components after Aisha identifies a structural flaw in her early designs. 80
• Collaborates with Rudeus on teleportation-circle improvements; Orsted states that their previous-timeline work improved a circle used for long-distance travel. 102
• Developed the concept of a mana-powered hibernation pod to endure the wait for a future transportation event. 124

Dragonkin physiology and mana use

After becoming Dragonkin, Nanahoshi gains access to mana and can personally operate magical devices and circles.

• Can infuse mana into magic tools, unlike her original human body. 208
• Her transformed body is heavier and has a greater appetite than before. 184
• Her Dragonkin status is incomplete for research purposes: her blood is not equivalent to that of a true dragon. 258

Potion and magic-tool development

Nanahoshi develops potions and practical magic items through extensive experimentation.

• Researches a potion intended to extend Rudeus’s lifespan. 221
• Requires blood from numerous true dragon species to perfect her Dragonkin-potion research. 258
• Created a bracelet that protects against magic attacks up to advanced-tier spells. 208
• Keeps numerous recreational and utility magic tools for the Greyrat children. 248
• Uses Zanoba’s exceptional physique as a willing test platform for potion experiments, while relying on detoxification magic and Orsted’s healing scrolls as safeguards. 219

Otherworldly knowledge

Nanahoshi applies knowledge and memories from Earth to local culture and commerce.

• Reconstructed mahjong from memory, including its tiles, engravings, and rules. 235
• Offered Ariel commercial advice that contributed to the development of Asura’s shopping districts. 302
• Retains knowledge of Earth food and entertainment, including pufferfish preparation, games, novels, and anime. 274 302

Equipment / Weapons / Items

• Research blueprints and laboratory records — extensive notes on teleportation circles, potions, and Dragonkin research. 80 258
• Storage ring — an item provided by Orsted, used to store research materials and potions. 221
• True dragon blood — granted by Ilsarion for Nanahoshi’s lifespan-extension research. 270
• Mahjong set — personally manufactured from remembered Earth rules and designs. 235
• Protective bracelet — a self-made magic item capable of blocking magic through advanced-tier spells. 208
• Rings and necklace from Rudeus — exchanged during their first date after becoming lovers. 274

Relationships

• Rudeus Greyrat — fellow Earthling, research partner, closest friend, and eventual husband. Their shared work and mutual reliance become romantic after they confront the alternate future shown by Ilsarion. 65 272 302
• Orsted — ally and fellow researcher whose laboratory serves as a major meeting point; he provides Nanahoshi with resources, including a storage ring and healing scrolls. 91 219 221
• Aisha Greyrat — research collaborator and friend. Aisha identifies flaws in Nanahoshi’s teleportation designs and agrees to help in the laboratory. 80
• Lara Greyrat — Rudeus’s daughter and a key helper in the search for the World-Gazing Dragon; Lara also recognizes Nanahoshi’s future place in the family early. 253 262 270
• The Greyrat wives and children — initially know her as “Sister Nanahoshi,” then actively welcome her into the household after her relationship with Rudeus begins. 273 274 298
• Zanoba Shirone — potion test subject and collaborator. Nanahoshi arranges for him to test her potions in exchange for Rudeus teaching him magic for dollmaking. 219
• Lu Yang — Nanahoshi’s boyfriend in the alternate Earth life witnessed through Ilsarion’s vision; their relationship progresses from friendship to cohabitation and pregnancy. 264 265 266
• Ilsarion, the World-Gazing Dragon — grants her true dragon blood after viewing the memories and alternate futures of Nanahoshi and Rudeus. 263 270

Notable Quotes

“I want to try living happily for the rest of my life too.” 272

“Fine. You’re the one I’d hate to leave behind.” 272

Trivia

• Nanahoshi initially cannot use magic, but later gains mana use after becoming Dragonkin. 170 208
• She is notably poor at concealing her reactions during card games, according to Cliff. 280
• She jokingly refers to judging Tina’s potential suitor from the perspective of “Black Mom.” 278
• Nanahoshi sets a firm boundary with Rudeus: she will not tolerate him taking a sixth lover. 274