CUBE is credited as the production brand in "Seven Days with Sharks."
| A seven-day job with sharks | Brand production |
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Seven days spent with sharks, related to crafts
CUBE is credited as the production brand in "Seven Days with Sharks."
Natsuno's final exit
Kazuki Fumi submitted two projects to CUBE that fit the brand's style and were close to her personal tastes; the latter was ultimately selected and developed into "Natsu no Shujiki."
Single-line conceptualization and branch selection
Fumi Kazuki recalled that "Natsu no Owari" was initially conceived as a single-story storyline, later considering more complex branching structures to increase gameplay content.
The protagonist's personality and empathy
In 'Summer of the Last Extinction,' Kazuki Fumi balances the protagonist's own personality with the player's empathy, and uses a single female lead structure to focus on their relationship.
The freedom and constraints of original artwork orders
The key animation commission for Natsu no Tsukiki deliberately left room for the artist to shine, and Kazuki Fumi didn't completely kill the exterior; He also requested three sets of casual wear to avoid having the same outfit on two consecutive days.
Transitioning the prologue of the publicity
Kazuki Fumi wrote a new prologue for Natsuno's End-Extinction promotion, avoiding obvious dates and other external time information, so this new text could be accessed in the trial version.
Live comparison of four types of voices
According to Kusuhara Yui's recollection, when recording "Koishisairu Justice Ranman," CUBE had her try out different voices—low voice, self-directed direction, a higher pitch, and a younger doctorate image—and then compare them on set. This has led to adjustments to the calm and mature image originally prepared for appearance.
Invitation to write for 'Summer Ends.'
According to the recollection of PR Katahito, after the trial version was released, he saw Kazukifumi's tweet asking about live streaming permission, sent a private message, and started a conversation. At the time, he was considering inviting a screenwriter for Sonora in the future, while CUBE's supervisor had already commissioned him to write a new work. Kazuki Fumi also explained that the title was proposed by the brand, but was later changed from 'Natsu no Tsuiji' to 'Natsu no Otsuji'.
Voice selection and audition for works led by single female leads
Katahito recalled, 'Natsu no Tsuwa no Tsuiki' had only one female lead, so when choosing voices, they focused on finding an actress suitable for Mio, ultimately inviting Rina Misaki. After the first voice delivery, he auditioned and felt that his acting and voice matched his ideal character; This delivery also eased the anxiety of the initial collaboration.
Related entries
- Participated Works:Seven days spent with sharks
- The screenwriter who proposed the 'Natsu no Tsuki' project:かずきふみ
- Actors participating in the comparison of four voice types in 'Koishi Iroru Justice Ranman':くすはらゆい
- Reviewing the invitation process for "Summer Ends" and the screenwriter who announced the title:かずきふみ
References
- CUBE: Seven Days of Living with Sharks and a work and production
- BugBug: CUBE Summer End-Cut Production Interview
- BugBug: Kusuhara Yui talks about audition and live comparison
Data compiled on: 2026-10-10.