Tsukishima, General Secretary and Advisor: "Kamitsubaki City under construction." REGENERATE', with credited roles including director, original work, script, and world-building design.
| Works Positions | Kamitsubaki City is under construction. REGENERATE / Director, original work, script, and worldview design |
|---|---|
| Related works | Secret Game Second Stage |
| Secret Game Second Stage: Signature Post | New Script Team Members |
| Secret Game: Second Stage Switch version: Post | Script |
Participated in works
"Kamitsubaki City under construction." REGENERATE: Director, original work, script, and world-building design.
Secret Game Second Stage: New Script Team Members
In 'Secret Game: Second Stage,' Souki Tsukishima is responsible for the new script team.
Secret Game: Second Stage is produced for the Switch version
The script for 'Secret Game: Second Stage Switch Version' is credited by Souki Tsukishima.
Check character actions by minute
Soki Tsukishima checks characters' actions within the facility minute by minute for Route A, avoiding conflicts between time and location.
A large-scale rewriting of the scale
Tsukishima Soki recalls that the original Root Double was almost entirely rewritten to improve pacing and reduce repetition.
A joint discussion of the final plot
Soki Tsukishima and Itakumi Nakazawa once disagreed on the final plot, but after rediscussion, they combined their ideas.
Combine the characters' individual stories
Soki Tsukishima first conceived separate stories for the main and supporting characters, then combined their experiences and creative ideas into the Root Double.
Early discussions with personal note-taking tools
In the early stages of producing "Root Double," Soki Tsukishima and Takumi Nakazawa discussed continuously for more than ten hours. In the same interview, Tsukishima also mentioned that he uses FrieveEditor to manage ideas and notes in his work.
Preparation for reading hard sci-fi scripts
In an interview, Souki Tsukishima recalled that to write "Root Double," he continuously studied hard science fiction; Supervisor Nakazawa gave him a minimum list of works he should read. Reading preparation helps him acquire the foundational knowledge needed to write the work.
Feedback on operational works and character proposals
When discussing writing for operational games, Souki Tsukishima said he reviews the reactions from characters and their expressions on social media, then continues to organize the story. In addition to responding to key figures assigned by the operators, he also proactively offers suggestions for in-depth depictions of specific characters.
Rebellions proposed writing with three people
Tsukishima recalled that while he was still working on "Root Double," Hinata and Tora had already prepared several simple plot cases for "Rebellions" based on memos from the original creators. After he officially joined, he picked ideas and the three of them worked together to build the story; B proceeded smoothly, and C discussed for several days to avoid repeating A and B, and the final plan was adopted after Nakazawa's approval.
When explaining Team Tsukishima's collaboration, Tsukishima said the three of them first discussed ideas, mainly selecting opinions and organizing them into a coherent plot. After completing the plot case, they are assigned to write together according to their strengths; Even when he was in charge, the scenes he wrote would still be pointed out by Hinata and Tora. He also explained that Tora supplemented his weak areas with comedy, school themes, and ideas, while Hinata provided logical construction and solutions to plot problems.
Decide on the direction of adaptation with the director
Tsukishima recalled that during discussions with Nakazawa during the "Rebellions" meeting, he decided to rewrite B and add a C role, listening to the director's wishes to give the original characters little room to shine and make future developments unpredictable.
The original version requires depicting tragic outcomes
According to Nakazawa's 2011 interview on the original development of Root Double, Soki Tsukishima disliked detailed depictions of brutal scenes. Nakazawa still asked him to write a necessary but not excessive tragic outcome, leaving players with regret for not saving others and motivating them to lead the story toward a better outcome.
"Kamitsubaki City under construction." An early project of '
In a 2026 interview, Souki Tsukishima recalled that in November 2019, Sou Momo invited Tsukishima to create stories about the Kamitsubaki artists and introduced Tsukishima to meet PIEDPIPER. The following month-long continuous discussion determined the world, the stage, and the main figures; The title and format of ARG were decided before Tsukishima joined.
Parallel production of pre-story stories and spin-offs
"Kamitsubaki City under construction." While EMERGENCE was still in development, Tsukishima had already completed its story and begun writing the prequel novel 'Memoirs of a Certain Observer,' while also advancing 'REGENERATE,' 'NARRATIVE,' and animation. The direction of the series expansion was already decided during the production of "EMERGENCE"; Tsukishima continues to handle world setting and supervision, with each work having its own director and main producer.
Deduce the sci-fi setting from the theme
Tsukishima gathered ideas from PIEDPIPER into global themes, defering settings such as fragments and terrarium cities. Originally, the characters were contrasted with witches and demons, but after discussions about science fiction and PIEDPIPER's wording, the 'teserator' setting was formed. Tsukishima also continues to observe discussions on Kamitsubaki's official Discord, using viewer-submitted clues from the Descartes demonic thought experiment to conceive a formidable opponent.
Invitations for VR project performances and script assignments
Tsukishima recognized Regista's performances through collaborations on "Root Double" and "Rebellions" and invited its members to participate in "Kamitsubaki City Under Construction." VIRTUAL REALITY》。 According to Takuya Himeji of Gugenka, Tsukishima also included performance assignments in the script, allowing members who were taking on visual novel scripts for the first time to create scenes based on the designation and combine Regista's production experience to complete the work.
Song-by-track negotiation for VR music
Kento Asahina wrote in 'Kamitsubaki City Under Construction.' In the music interview on 'VIRTUAL REALITY,' he and Souki Tsukishima repeatedly discussed the overall story and the role of track-by-track BGM. These exchanges continue over years, with both sides proposing ideas and forming music through communication.
Related entries
- Participated Works:Kamitsubaki City is under construction. REGENERATE
- Participated Works:Secret Game Second Stage
- Team:Team Tsukishima
- Script works:Secret Game Second Stage
- Minute-level action checks and rewritten original scripted works:Root Double -Before Crime * After Days-
- Supervision of jointly discussing the final plot and organizing discussion records:Nakazawa Ko
- Original supervision for hard sci-fi reading lists:Nakazawa Ko
- According to Tsukishima: Preparing the Rebellions plot together, Hinata provided logical construction and problem solutions:Hinata bean sprouts
- According to Tsukishima: Tra co-writes with comedy, school themes, and ideas:Tsukishima Tora
- According to Tsukishima's recollection: After the director approved Rebellions' Plan C, the following was adopted:Nakazawa Ko
- Director who requested the original tragic outcome depiction:Nakazawa Ko
- Entrusted with writing the original work with the necessary tragic outcome:Root Double -Before Crime * After Days-
- In 2019, the team invited to discuss the Kamitsubaki worldview:KAMITSUBAKI STUDIO
- According to Tsukishima's recollection, the team invited to participate in the VIRTUAL REALITY performance:Regista
References
- Kamitsuna: Complete Japanese introduction to REGENERATE
- Yeti: Rebellions is produced and published
- Provided by Yeti: Secret Game for both Switch versions
- Dengeki: Soki Tsukishima Talks about Root Double Script (2)
- Dengeki: Soki Tsukishima Talks about Root Double Script (3)
- Dengeki: Soki Tsukishima Talks about Root Double Script (4)
- Ultima: Team Tsukishima and Tsukishima's Comprehensive Script Production Interview
- Dengeki: Soki Tsukishima Talks About Rebellions Script Production (Page 2)
- Dengeki: Soki Tsukishima Talks About Rebellions Script Production (Page 1)
- Dengeki Online: Nakazawa Kou talks about Root Double Part (Part 1)
- Shen Tsubaki: Three interviews with VIRTUAL REALITY production staff
Data compiled on: 2026-10-12.