Shibuya Girls International School Students Participate in Development of SB Innoventure's Voice SNS 'day' — From Sticker Design to SNS Promotion

Shibuya Girls International School (hereinafter, 'the School'), which teaches next-generation skills such as English conversation, video production, and SNS management, conducted a vocational experience workshop in February 2026, with two of its students participating in a joint project with SB Innoventure Corporation (hereinafter, 'SB Innoventure'), which provides the voice SNS app 'day'.

<Overview of Implementation>

Program Name: Voice SNS 'day' Vocational Experience Workshop

Implementation Period: February 2026

Collaborating Company: SB Innoventure

Participating Students: Sayuki (2nd generation student), Riin (3rd generation student)

Not 'Classes' but 'Work'. High School Students Participate in App Product Development

① 'How to convey the appeal of 'day' to our generation?' — Challenging sticker planning and TikTok video production

The theme of the workshop was 'How to convey the appeal of 'day' to our generation?'. Sayuki and Riin took on the challenge of planning voice stickers that could be used within the 'day' app.

Reflecting on their daily lives, such as after-school chats and moments of excitement during 'oshi-katsu' (supporting their favorite idols/characters), they selected words they would want to use for reactions. Based on familiar words they commonly use, such as 'meroi' (charming), 'emoi' (emotional/nostalgic), 'metsu' (destroy/awesome), and 'kawaisugiyaro' (too cute, isn't it?), they made concrete proposals covering font selection, voice tone image, and visual design.

For 'emoi,' they combined it with a retro cassette tape visual, and for 'kawaisugiyaro,' they drew an original illustration on the spot, showcasing the unique sensibilities of current high school students throughout their proposals.

Furthermore, they also challenged themselves to create TikTok videos to convey the charm of 'day' to their generation. The two, who regularly post on SNS, created videos that leveraged their individual personalities.

▼Video created by Riin https://youtu.be/oMKjL00MKjQ?si=fRGUxYV_QaU4fm8H

▼Video created by Sayuki https://youtu.be/vBR9Aab7xeg

② Presenting SNS utilization methods to the development team. From 'users' to 'providers'

In the latter half of the workshop, the two students gave a presentation on SNS utilization methods to SB Innoventure's development team.

They shared real know-how that only they, as daily SNS users, could articulate, covering topics such as optimizing posting times, catching up on trends, and their dedication to video editing. They spoke about their experiences of trial and error in the fast-paced environment where 'trends change in a week.'

Re-evaluating SNS, which they usually 'use,' from the perspective of 'providing' it — this experience became a significant learning opportunity that they could not have gained in a classroom.

③ 'What cannot be learned in the classroom.' The reason the School emphasizes vocational experience

The School values opportunities for students aiming to become entrepreneurs and creators to engage with real-world business while still enrolled. This workshop was not merely a visit or a simple experience; it was realized as a program where students participated in the actual app product development process, consistently experiencing everything from planning and production to presentation.

Participating students Sayuki and Riin demonstrated the SNS marketing and video production skills they had cultivated in their regular classes in a practical setting. The 'day' development team highly praised them, stating, 'We were able to understand the real sensibilities unique to high school students,' and 'We gained many hints for thinking about the service.'

The School will continue to actively create opportunities for practical learning through collaboration with companies, providing an environment where each student can grow while connecting with society.

About Voice SNS 'day'

'day' is a voice SNS app provided by SB Innoventure Corporation. With a unique design that does not have a text posting function and requires 'voice' for all posts, it offers a new form of communication that can convey the nuances of words and the mood of the moment as they are. Reactions to friends' posts are also done by voice, and its ability to connect casually with close people has gained support mainly among the younger generation.

<Download the app here>

https://apps.apple.com/jp/app/day-%E5%A3%B0%E3%81%A7%E3%81%A4%E3%81%AA%E3%81%8C%E3%82%8B-%E9%A3%BE%E3%82%89%E3%81%AA%E3%81%AA%E3%81%84sns/id6733229268

*Please note that this service is scheduled to terminate on May 31, 2026.

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Details of this initiative are also introduced in SoftBank News.

▶ 'Voice diary' sensation, recording the mood of the moment. The reality of the voice SNS 'day' spreading among high school students.