LOST10 is airing in the TBS Friday 10 p.m. slot, with episode 4 broadcast on the 6th. That episode moved Komaru and Nao to Tokyo and revealed that Nao's 6-year-old daughter died in a traffic accident.
LOST10 is a TBS Friday drama that premiered October 16, 2026 at 10 p.m., with Ryusei Yokohama as Komaru and Shun Oguri as Nao, a freelance insurance investigator. The story is set in Hokkaido and turns on the Shikaradake Incident, a mountaineering accident during a trekking tour. Satoko Okudera wrote the screenplay, Ayuko Tsukahara directs and Junko Arai produces. U-NEXT and Netflix stream the series in Japan, and Netflix plans worldwide distribution.
The cast filled out through August and September. Nine additional cast members and a character relationship chart arrived in September, placing Yu Yoshizawa as Endo, a Hokkaido Police instructor who becomes Komaru's superior, and Mirai Yamamoto as Masu Tomo, a section manager at an insurance company tied to Nao. All 10 main characters were announced by September 11. Anne Nakamura plays Aya, a junior high school teacher stranded during a hiking tour.
Once on air, the case moved away from a single accident. Episode 2, aired on the 23rd, ended with tour guide Tabata, played by Marie Iitoyo, jumping from a rooftop after a phone call from someone at the hospital. Tabata had a daughter with an intractable disease and was positioned to handle the tour participants' mountain insurance. Episode 4, aired on the 6th, sent Komaru and Nao to Tokyo chasing Harune, where they found security camera footage of tour customer Monden alive in Shibuya. Chika asked Nao to look into her sister Tabata's death, and the same episode revealed that Nao's 6-year-old daughter died in a traffic accident that happened in front of him.
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Episode 4 of LOST10, the TBS Friday drama starring Ryusei Yokohama, aired on the 6th and revealed the past of Nao, the insurance investigator played by Shun Oguri. His wife Akane, played by Mijika Ichikawa, tells Kokoma that the couple lost their 6-year-old daughter in a traffic accident that happened in front of Nao. Posts on X called the reveal painful, and others responded to the buddy feeling between the two leads.
Episode 4 of TBS drama LOST10 airs on the 6th at 10 p.m. Komaru (Ryusei Yokohama) and Nao (Shun Oguri) head to Tokyo chasing Harune (Yuki Saito), then find security camera footage of Monden (Kokai Hyodo), a tour customer confirmed alive in Shibuya after a mountain accident. Chika (Kayo Noro) also asks Nao to look into her sister Tabata's death.
The second episode of TBS's Friday drama LOST10, starring Ryusei Yokohama, aired on the 23rd and closed with tour guide Tabata, played by Marie Iitoyo, pushing past Komako and jumping from a rooftop. Tabata had gone missing after a phone call from someone at the hospital. Her daughter Nono has an intractable disease, and Tabata was positioned to handle the tour participants' mountain insurance.
Ryusei Yokohama stars in LOST10, a TBS Friday drama starting October 16, 2026 at 10 PM. Set in Hokkaido, the human suspense story follows the Shikaradake Incident, a mountaineering accident on a trekking tour. Shun Oguri plays a freelance insurance investigator, Anne Nakamura a stranded participant. The cast also includes Marie Iitoyo, Satoru Iguchi, Kenji Iwatani, Kohei Matsushita, Mikako Ichikawa and Kayo Noro.
The TBS Friday drama LOST10, starring Ryusei Yokohama, announced nine additional cast members and a character relationship chart ahead of its October 16 premiere. Yu Yoshizawa plays Endo, a Hokkaido Police instructor who becomes Komaru's superior, and Mirai Yamamoto plays Masu Tomo, a section manager at an insurance company tied to Oguri's character Nao. U-NEXT and Netflix will stream the series in Japan, with Netflix planning worldwide distribution.
TBS announced that Kouhei Matsushita and Michiko Ichikawa will appear in LOST10, the Friday drama starring Ryusei Yokohama. Matsushita plays Nobori, a company president in Hokkaido. Ichikawa plays Akane, a Tokyo insurance company employee. With the two additions, all 10 main characters have been announced, alongside Shun Oguri, Anne Nakamura, Marie Iitoyo, Satoru Iguchi, Kenji Iwatani, Kayo Noro, and Yuki Saito. The drama airs on TBS in October.
TBS's Friday drama LOST10 has added Yuki Saito and Kenji Iwaya to its cast, bringing the announced roster to eight. Saito plays Harune, a family member of a missing mountain tour participant. Iwaya plays Awashima, a police chief and the boss of Ryusei Yokohama's detective. The final two cast members will be revealed on September 11. The show starts in October.
King Gnu vocalist and keyboardist Inoue Satoru will appear as pediatrician Yoshino in the TBS Friday drama LOST10, starring Yokohama Ryusei, starting in October. This marks Inoue's first regular appearance in a TV drama series. Actor Nolo Kayo joins as Chika, the older sister of Tabata, played by Iiboshi Marie.
Anne Nakamura and Marie Iitoyo will appear in the TBS Friday drama slot October series "LOST10," starring Ryusei Yokohama and co-starring Shun Oguri. Nakamura plays Aya, a junior high school teacher stranded during a hiking tour, while Iitoyo plays Tabatake, the tour guide. Both roles connect to the Shikaradake Incident at the story's center.
Ryuusei Yokohama will star in the TBS Friday drama slot LOST10 for the October 2026 season. It is his first commercial broadcast drama since the 2025 NHK Taiga drama Berabou, and his first solo lead role in a prime-time drama series. The original suspense story reunites him with screenwriter Satoko Okudera, director Ayuko Tsukahara, and producer Junko Arai.