Sunday

Biodata

Feature	Details
Name	Sunday (星期日)
Alias(es)	Former Oak Family Head; Passenger Sunday
Gender	Masculine
Affiliation	The Family / Oak Family (formerly); Star Rail Express (passenger) 695 1131
Occupation / Role	Organizer of the Grand Symphony Ceremony; former high-ranking Family official; former Oak Family Head 602 695
Status	Active; travelling aboard the Star Rail Express 1131 1135
First Appearance	Chapter 602

Appearance

Sunday is depicted in a white formal suit during his meeting with Sandstone and Dr. Ratio. He has wing-like features on his head, which Yan Huan later references while discussing him. 674 1505

• White formal attire. 674
• Wing-like head adornments/features. 1505
• Maintains a composed posture and carefully measured smile even under pressure. 1131 1861

Personality

Sunday is articulate, controlled, and deeply idealistic. He believes that a paradise must protect those unable to face reality alone, though his former pursuit of this ideal led him toward Order and the imposition of a collective dream. 729 730 742

He takes responsibility for Penacony and Robin seriously. Even after the failure of his plan, he accepts the consequences of the disaster and remains concerned for his sister’s safety. 776 1097

After joining the Express, Sunday demonstrates humility and a willingness to learn from former opponents. He does not claim to possess the will of Trailblaze, but seeks answers through travelling with the Nameless. 1130 1131

Abilities & Skills

Harmony Compulsion

Sunday can use Harmony’s power to force answers from a target.

• Immobilized Sandstone and compelled him to answer a sequence of questions truthfully. 675
• Used the ability to test Sandstone’s character and investigate the Keystone, his memories, and his origins. 674 675
• His attempt to incapacitate Robin and Welt affected Robin, but Welt remained unaffected. 742

Order and Dream Manipulation

Sunday formerly wielded powers associated with Order within Penacony’s dreamscape.

• Arranged the three “Prelude Plays” to present Penacony’s past, present, and intended future before the Grand Symphony Ceremony. 752 753 755
• Prepared the Penacony Grand Theater as the heart of the Beautiful Dream, the location of the Stellaron, and the stage for the final confrontation. 756 757
• Sought to realize Taiyi’s Dream, an all-encompassing paradise in which guests would remain within beautiful dreams. 776

Concealment

Sunday can hide his true form after becoming a passenger of the Express.

• To outsiders, he appears as a disguised Automaton rather than himself. 1131
• He agrees to remain inconspicuous so that The Family does not discover that he is aboard the train. 1131

Political and Strategic Judgment

• Investigated the internal traitor connected to the “Death” case despite pressure to prioritize the Grand Symphony Ceremony. 695
• Recognizes that Harmony can be both Trailblaze’s ally and its enemy, and warns Welt of threats operating beneath its surface. 1130
• Continues acting cautiously in later interstellar affairs, including investigations involving the Xianzhou delegation and the Phantom Moon Game. 1934 1968

Background

Sunday served as the head of Penacony’s Oak Family and as organizer of the Grand Symphony Ceremony. Alongside Robin, he welcomed the Star Rail Express to the Daydream Hotel, upgraded their rooms after their check-in difficulties, and offered the crew assistance. 602

Before the public crisis reached its peak, Sunday investigated the “Death” case within the Family. A letter from Old Audie urged him to set aside that investigation and focus on the ceremony, revealing the political pressure placed upon him as Oak Family Head. 695

Recovered memories also show that Sunday once faced Yan Huan during an earlier Penacony incident. Yan Huan publicly held Firefly hostage, trapped a bystander’s consciousness within the dream, and demanded an enormous ransom; Sunday negotiated and ultimately paid to protect Firefly and preserve the Oak Family’s public standing. 1868 1869

Story Role / Major Arcs

Penacony’s Beautiful Dream

Sunday initially defended Penacony’s dream as a refuge for those who could no longer endure reality. Robin challenged this belief, arguing that dreams could not solve suffering at its source, while Sunday insisted that not everyone was capable of walking toward the future. 729 730

He later revealed that he and Robin were never truly children of Harmony and that he believed lasting happiness could only be guaranteed by a single authority standing above the masses. 742

Grand Symphony Ceremony and Defeat

Sunday invited the Express crew to the Penacony Grand Theater, presenting the coming confrontation as a decision over Penacony’s future. 750 757

His plan collapsed after the Beautiful Dream turned into a nightmare for its guests. The resulting loss of contact with the dream caused mass checkouts, damaged Penacony’s reputation, and left Sunday detained by Sandstone and Yan Huan when the Company fleet arrived. 776 777

Responsibility After the Crisis

Following the fall of Order’s plan, Sunday remained determined to help Penacony despite hostility from Family members and the risks of returning to Morning Dew Mansion. 1097 1099

He acknowledged that no individual could be a sole savior. While creating a paradise remained his aspiration, he concluded that it must be built “brick by brick” rather than imposed through his former methods. 1130

Star Rail Express Passenger

Sunday asked to travel with the Express in order to learn from the Nameless and seek answers beyond Penacony. Welt supported the request, and Himeko accepted him on the principle that the train’s doors should remain open to those willing to journey forward. 1130

He officially became a passenger before the journey to Onfaros. Pom-Pom subsequently assigned him cleaning duties in the observation car and guest-cabin corridors, which Sunday accepted respectfully. 1131 1135

Relationships

• Robin — Younger sister and closest family bond. Sunday is fiercely protective of her, while Robin challenges his beliefs about dreams, freedom, and happiness. 602 729 742
• Yan Huan — Former adversary whose actions repeatedly challenged Sunday’s authority in Penacony. Yan Huan later supports Sunday’s request to board the Express, while Sunday promises to protect his new companions. 776 1130 1131
• Welt — Former opponent who listens to Sunday’s warnings about Harmony and supports his request to travel with the Express. 1130
• Himeko — Accepts Sunday as a passenger after trusting Welt’s judgment and the group’s decision. 1130 1131
• Pom-Pom — Train Conductor who assigns Sunday duties and introduces him to the Express’s train-fund system. 1135
• The Dream Master — A mentor-like figure who claimed to have guided and orchestrated Sunday’s destined path toward its end. 752
• Sandstone — Company operative whom Sunday interrogated using Harmony’s power; Sandstone later participated in Sunday’s detention after the Beautiful Dream’s collapse. 674 675 776

Notable Quotes

“Humanity is the measure of all things; no single person is the sole savior.” 1130

“Creating a paradise remains my lifelong aspiration, but in the journey ahead, I must build it brick by brick.” 1130