OASIZ to Start Streaming Two Spin-off Short Dramas Linked with Terrestrial TV Drama “Show Drama presents Seikai ga Wakaranai” at Noon on Monday, September 7th Theme Song is a Newly Written Track by Popular SNS Singer-Songwriter Mari Crane-up Comments from Lead Actress Hina Kawata Have Also Arrived

OASIZ Inc. (Headquarters: Shibuya-ku, Tokyo; Representative Director: Yu Eto; hereinafter “OASIZ”), which supports brand marketing through SNS and vertical video, announces the production of two spin-off short dramas, “Are You Human?” and “A Person Who Shouldn’t Exist,” linked to the main story of the terrestrial drama “Showdrama presents Seikaiwakaranai” to be broadcast late at night on Friday, September 11, 2026, on ABC TV, through the short drama account “Seikaiwakaranai” that we plan, produce, and operate. These works will be distributed on the official accounts of “Seikaiwakaranai” and “Showdrama” starting at noon on Monday, September 7, 2026.

We are also pleased to announce that the theme song for this work has been decided as “Paraffin,” an original song written by singer-songwriter Mari, and that comments from lead actress Hinata Kawata upon completing filming have arrived.

■”Are You Human?” and “A Person Who Shouldn’t Exist”

 Synopsis

◆”Are You Human?”

Strange vendors come to the school. Vendors trying to bring people back to life with AI. While Misaki instinctively finds it creepy, she becomes slightly interested. Will Misaki, who carries the sadness of her mother’s death, reach for this service—?

◆”A Person Who Shouldn’t Exist”

Two officials from the national agency, the Existence Verification Bureau, visit the home. The Existence Verification Bureau officials throw harsh words at Michiko, who is an AI. Does the technology to bring back the deceased create happiness, or—?

・”Are You Human?”　　　　　　　　　　　　　　　　　　　　　・”A Person Who Shouldn’t Exist”

■ Special Features

◆ Another “story without a right answer” not depicted in the main series

The two works being distributed this time are spin-off works capturing another perspective on “deceased resurrection AI” that could not be fully depicted in the terrestrial drama main series. For the short drama, Tomoki Shirakawa, who wrote the screenplay for the main series, continues as screenwriter, and director Sao Ito from the Seikaiwakaranai team was brought on board to carefully depict a world continuous with the main series while leveraging the tempo unique to short dramas. Through the emotional fluctuations of characters living in an “era where the right answer is unknown,” it questions how we should confront a society where AI is rapidly permeating daily life. By distributing prior to the main series broadcast, it creates a structure that allows viewers to enjoy the worldview of the story more deeply.

Title	Showdrama “Are You Human?” / “A Person Who Shouldn’t Exist”
Distribution Date	Monday, September 7, 2026, from noon~
Distribution Accounts	Seikaiwakaranai, Showdrama (@showdrama_24)
Positioning	Spin-off work linked to the terrestrial drama “Showdrama presents Seikaiwakaranai” main series
Cast	Hinata Kawata, Tomomi Nakai, Yuri Umakoshi, Hiroaki Kawazure, Aya Nishibori, Junko Sakurai, Wunparunpa (OASIZ affiliated), and others
Screenplay	Tomoki Shirakawa (OASIZ_Seikaiwakaranai)
Director	Sao Ito (OASIZ_Seikaiwakaranai)
Production	Progress Corporation, OASIZ Inc.
Production & Copyright	ABC TV

■ Theme Song Information

◆ Theme song is an original composition by notable singer-songwriter Mari with her transparent voice

＜Mari Profile＞

A singer-songwriter who performs with her transparent voice and lyrics that delicately depict daily struggles and hope. She uses her own watercolor paintings for jacket art, expressing a unique worldview where music and art merge. In 2026, she released a three-month consecutive release project “20%,” “Gunjo HAZE,” and “Start Line,” and held her first solo live “Start Line” at Shibuya eggman on August 30.

■ Filming Completion Information

◆ Lead actress Hinata Kawata completes filming with a smile

A joyful message has arrived from Kawata, who successfully completed filming for this work, her first drama appearance after graduating from Hinatazaka46! The filming completion scene will also be released on “I’m an AD for a certain terrestrial drama,” so please look forward to it.

◆ Misaki Matsuzaki role　Hinata Kawata　Comment

I haven’t had much experience with this kind of acting, but everyone was so kind in teaching me, and it was truly a very enjoyable set. It was fun until the very end. Thank you very much.

◆Michiko Matsuzaki role・Junko Sakurai Comment

“I’ve played various mothers until now, but AI was a first (laugh). It was a good experience. I want to continue (acting work) long and thin from now on, so I look forward to working with everyone. Thank you very much.”

◆Nanami Matsuzaki role・Tomomi Nakai Comment

“Thank you for your hard work. I’m looking forward to the completion. Thank you very much.”

◆30-second PR using theme song & first-released main series footage released

A teaser PR using the drama theme song “Paraffin” and first-released main series footage has been released. You can view it on the program website and various SNS.

URL: https://youtu.be/1C5KzJgFPnI

■ Broadcast Information (Terrestrial Drama Main Series)

Program Name	“Showdrama presents Seikaiwakaranai”
Broadcast	ABC TV　Friday, September 11, 2026, late night 0:24 AM – 0:54 AM (Kansai local)
Catch-up Streaming	After ABC TV broadcast, streaming on TVer and ABEMA
Official Website	https://www.asahi.co.jp/seikaigawakaranai/

■ About Distribution Accounts

＜Seikaiwakaranai＞

TikTok: https://www.tiktok.com/@seikaiwakaranai

Instagram: https://www.instagram.com/seikaiwakaranai/

YouTube: https://www.youtube.com/@seikaiwakaranai

＜Showdrama＞

TikTok: https://www.tiktok.com/@showdrama_24

Instagram: https://www.instagram.com/showdrama_24/

X: https://x.com/showdrama_24

YouTube: https://www.youtube.com/@SHOWDRAMA_24

■What is “Seikaiwakaranai”

“Seikaiwakaranai” is a vertical short drama account originating from TikTok, planned, produced, and operated by OASIZ Inc. It is one of OASIZ’s main IP accounts and has continued to depict the emotions, friendships, romance, SNS, family, job hunting, and dreams of people in their teens and 20s living in an “era where the right answer is unknown” through short dramas.

Rather than denying “having no right answer,” it throws this uncertainty to the world through short dramas, calling for the importance of deriving one’s own right answer. In 2026, it won the Grand Prize at the “Mynavi Short Drama Award 2026” and is using that prize money to challenge the new format of terrestrial drama for the first time.

Account Name	Seikaiwakaranai
Platform	TikTok: https://www.tiktok.com/@seikaiwakaranai / Instagram: https://www.instagram.com/seikaiwakaranai/ / YouTube: https://www.youtube.com/@seikaiwakaranai
Total Views	Approximately 500 million views　 *As of September 2026　 *Combined total of TikTok, Instagram, and YouTube accounts
Planning, Production, Operations	OASIZ Inc.

■ Accepting Inquiries for Corporate Tie-ups and Collaboration Content

OASIZ accepts inquiries at any time for production of tie-up short dramas/collaboration content with companies utilizing our own IP accounts including “Seikaiwakaranai.” Please utilize this for expanding awareness of products and services, branding, and communication measures starting from vertical short dramas.

For inquiries about corporate tie-ups and collaborations, please send them through the OASIZ Inc. inquiry form.

▶ https://oasiz.org/contact

■ OASIZ Actively Hiring

We are currently recruiting a wide range of colleagues to challenge together at the forefront of the vertical short video market, including creative directors, editors, HR, and PR.

Through the distribution of this content, OASIZ will create contact points with culturally fitting talent, while promoting further strengthening of brand marketing support starting from SNS × vertical video, expansion of creator produce business, acceleration of original IP development, and creation of new economic zones starting from vertical video.

▶ Recruitment Information: https://herp.careers/v1/oasizinc

■ About OASIZ

OASIZ provides comprehensive support for brand marketing leading to awareness expansion and sales, starting from SNS × vertical video, from strategic planning to production and operations. We provide SNS account operation support and marketing support utilizing vertical video, boasting a track record of over 5.5 billion cumulative views and sales contributions. In 2026, our own operated account “Seikaiwakaranai” won the Grand Prize at the “Mynavi Short Drama Award 2026,” and our planning and production capabilities in the vertical short drama field were widely recognized. Going forward, we will promote the development of original IP starting from vertical video and the creation of new economic zones.

For inquiries about creator tie-ups and SNS marketing, please feel free to contact OASIZ.

Inquiries regarding video production and casting: https://oasiz.org/contact

【Company Overview】

Company Name: OASIZ Inc.

Established: October 2021

Representative Director: Yu Eto

Address: AMBRE 3・4F, 3-15-7 Sendagaya, Shibuya-ku, Tokyo

Website: https://oasiz.org/

・Official SNS

OASIZ Official Instagram: @oasiz_company (https://www.instagram.com/oasiz_company/)

OASIZ Official note: https://note.com/oasiz

＜Inquiries from media regarding this matter＞

OASIZ Inc.　PR: Yamaguchi E-MAIL: info@oasiz.org