Tohka

Biodata

Feature	Details
Name	Tohka (透华)
Alias(es)	Ryumonbuchi Toka; Toka; “mahjong idol”
Gender	Female
Affiliation	Ryumonbuchi High School Mahjong Club
Occupation/Role	Mahjong player; Ryumonbuchi family young lady
Status	Active
First Appearance	Chapter 1

Background / History

Tohka is Kageyama Sora’s cousin and a prominent player at Ryumonbuchi High School. When Sora arrives at the Ryumonbuchi estate, their relationship begins with embarrassment and bickering, but his interest in her mahjong knowledge gives them common ground. She introduces him to Amae Koromo and encourages him to study luck-based mahjong through their matches. 1 2

After witnessing Sora use absolute data-driven play to counter Koromo’s control of the table, Tohka immediately asks him to teach her. She sees data as a route to becoming a stronger player and finally surpassing her long-standing rival, Haramura Nodoka. 3

During the prefectural preliminaries, Tohka faces Nodoka in the Vice-Captain Battle. Her fixation on preventing Nodoka’s perfect game drives her to abandon a closed-hand win for a more conspicuous victory; she succeeds in interrupting Nodoka, but later becomes shaken after repeatedly dealing into Toyoko Momoko’s unnoticed riichi declarations. 42 46 47

After failing to maintain her champion standing in the individual tournament, Tohka struggles with the loss of the confident image she built through the previous year’s victories. Sora points out that 287 days remain before the next preliminaries, and she ultimately recommits herself to training. 67 71 72

She later takes an active role in preparations for the international training camp, securing additional VR wristbands for Kiyosumi’s players and training alongside Nodoka with the holographic mahjong AI. The defeat has made her more focused on improvement than on maintaining her usual social persona. 75 85 95

Appearance

Tohka is a poised young woman with long golden hair and a distinctive ahoge. Her appearance is usually carefully composed to project the elegance and status of a Ryumonbuchi young lady. 3 26

• Golden hair, often worn loose; her ahoge visibly reacts to her emotions. 3 47
• Emerald-green eyes. 44
• Frequently adopts refined, aristocratic clothing and mannerisms, including formal dresses, pearl accessories, and high heels. 26 75 165
• Has slender fingers with piano-practice calluses. 58

Personality

Tohka is proud, competitive, and intensely conscious of being noticed. She wants to be recognized as the “real idol” of mahjong, particularly when competing with Nodoka, whose popularity and precise play repeatedly provoke her jealousy. 29 30 36

Her pride also makes defeat difficult for her to accept. She tends to maintain an immaculate posture even when exhausted or upset, preferring not to let others see her vulnerability. 71 72 However, she responds deeply to sincere support and is capable of admitting her fears and frustrations to people she trusts.

Despite her haughty, tsundere demeanor, Tohka is attentive to others’ needs. She protects Koromo, supports her efforts to make friends through mahjong, and arranges conveniences for visiting teams during the training camp. 3 56 75 She also takes family responsibilities seriously, leaving personal plans behind when her grandfather’s affairs require her attention. 170

Abilities & Skills

Data-Driven Mahjong

Tohka is a data-oriented player who studies statistics, match records, and opposing styles to refine her decisions.

• Recognizes and values Sora’s “absolute data-driven play,” seeking to learn it herself. 3
• Studies records of high-ranking players and S-class professionals, researches unfamiliar playstyles, and commissions statistical match data. 43
• Uses calculation to identify Nodoka’s unusually rapid decision-making during the prefectural match. 29
• Her normal style emphasizes defensive stability rather than dramatic swings. 45

Challenge State

When faced with a powerful opponent, Tohka can enter a highly focused state that her teammates describe as calm, nearly flawless, and unlike her ordinary self.

• Her excitement rises as the opponent becomes stronger, bringing out a composed version of herself with no visible weaknesses. 44
• Tohka dislikes relying on this “Monster”-like state and prefers to win through her own effort. 44
• During holographic-game testing and training, she demonstrates a cool, powerful style compared to Amae Koromo’s and Saki Miyanaga’s Monster-level play. 108

Flood Control Mode

Tohka previously awakened Flood Control Mode during the National Tournament, forcing Megan Davin to alter her approach. The mode’s specific mechanics are not described. 99

Relationships

• Kageyama Sora — Her cousin and romantic partner. Their initially awkward relationship develops through mahjong, mutual teasing, emotional support after her defeats, and increasing trust. 1 3 72 162
• Amae Koromo — Her cousin and Ryumonbuchi teammate. Tohka acts as Koromo’s protector, reassures her that mahjong can help her find friends, and treats her as precious family. 3 56 166
• Kunihiro Hajime — Her maid and devoted teammate. Hajime continues wearing the chain Tohka gave her because it makes her feel as though Tohka is always beside her. 2 42
• Haramura Nodoka — Her principal mahjong rival. Tohka is jealous of Nodoka’s popularity and is determined to prove herself by defeating her. 4 29 42
• Inoue Jun — Ryumonbuchi teammate. Jun understands Tohka’s habit of becoming more formidable against strong opponents. 44
• Ryumonbuchi grandfather — Family elder whose business matters Tohka handles with seriousness and urgency. 160 170

Story Role / Major Arcs

Introduction and Sora’s Arrival

Tohka’s household becomes Sora’s entry point into the world of supernatural and luck-based mahjong. She introduces him to Koromo and the Ryumonbuchi Mahjong Club, while also becoming fascinated by his data-based approach. 1 2 3

Prefectural Preliminaries

As Ryumonbuchi’s Vice-Captain representative, Tohka confronts Nodoka directly. The match exposes both her determination and her weaknesses: she disrupts Nodoka’s perfect game, but her need to be eye-catching and her inability to perceive Momoko’s riichi contribute to her collapse. 42 46 47

Individual Tournament and Renewal

Tohka loses her opening individual match to Senoo Kaori’s Thirteen Orphans, then later confronts the pressure of no longer being the undefeated champion. With Sora’s support, she decides to direct her energy toward next year’s preliminaries. 67 71 72

Training Camp

Tohka joins the four-school training camp and participates in holographic-AI practice with Nodoka. Rather than focusing on romance or status, she devotes herself to training and preparation for future competition. 75 85 95

Ryumonbuchi Family Life

After Sora returns to the estate, Tohka continues caring for Koromo while navigating her complicated relationship with Sora. She proposes introducing Sora’s partners to one another, demonstrating an unexpectedly understanding view of his relationships. 161 162

Trivia

• Tohka prefers art films to animated movies. 161 162
• Her preferred gifts include burgundy-colored items, pearls, and luxury-brand accessories. 170
• She prefers a window seat when traveling. 75
• She and Koromo once went strawberry picking; Tohka brought extra strawberries home for Koromo while denying that this was her reason. 161