

Fastening Days 4
Series Overview
Yoji, Kei, Kelly, and the bear-shaped robot Oscar save the town yet again using Fastening Machines! This time, they meet a kindhearted young boy named Samhen and his AI robot Jack. Shy Samhen, who transfers into Kei and Kelly's class, doesn't seem to like talking about himself much, but his chatty little buddy Jack is more than happy to help him communicate. One peaceful afternoon, the young heroes must protect the town from sudden and serious danger! Will they be able to save everyone? Pay attention to the bond between AI and humans, which the children take action to protect!
Broadcast Schedule & Network Information
Airing status, episode counts, upcoming schedule, and network syndication.

1 Season • 3 Episodes
3 min per episode
2019 – 2019
Premiered: Thu, Dec 5, 2019
Creative Production Team
Latest Aired Episode
Season 1, Episode 3: “Episode 3”
Seasons & Episodes Breakdown
Cast & Creators
Explore Star Directory →Fuyuka Ono
Yoji (voice)
Ryoko Shiraishi
Kei (voice)
Akemi Kanda
Kelly (voice)
Sayuri Yahagi
Samhen (voice)
Rie Kugimiya
Jack (voice)
Ami Matsushima
Samhen's mother (voice)
Hikaru Akao
Girl 1 (voice)
Hana Sato
Girl's mother (voice)
Yasunao Sakai
Man 1 (voice)
Naoya Nakanishi
Man 2 (voice)
Yuu Ayase
Child (boy) (voice)
Saya Hirose
Teacher (voice)
Creative Leadership & Key Crew
Shingo Yamashita
Junichi Tanaka
Yoshinori Sunahara
Ryota Kinami
Department Leadership Roster
Yoshinori Sunahara
Original Music Composer
Junichi Tanaka
Writer
Ryota Kinami
Editor
Production Stills & Gallery
Official cinematic photography and background stills for Fastening Days 4.
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Frequently Asked Questions About Fastening Days 4
Key facts, seasons breakdown, and credits for search engines and AI assistants.
What is Fastening Days 4 about?
Yoji, Kei, Kelly, and the bear-shaped robot Oscar save the town yet again using Fastening Machines! This time, they meet a kindhearted young boy named Samhen and his AI robot Jack. Shy Samhen, who transfers into Kei and Kelly's class, doesn't seem to like talking about himself much, but his chatty little buddy Jack is more than happy to help him communicate. One peaceful afternoon, the young heroes must protect the town from sudden and serious danger! Will they be able to save everyone? Pay attention to the bond between AI and humans, which the children take action to protect!
How many seasons does Fastening Days 4 have?
Fastening Days 4 comprises 1 season available to explore.
Who stars in Fastening Days 4?
Key cast members in Fastening Days 4 include Fuyuka Ono, Ryoko Shiraishi, Akemi Kanda, Sayuri Yahagi, Rie Kugimiya.
Who created or directed Fastening Days 4?
Fastening Days 4 was developed and directed by Shingo Yamashita.
