[In-depth explanation] What was the cause of death of Ryu Nagashima? Nagashima, who appeared on 24-Hour Television, died at the age of 28, leaving behind his wife and child.

Ryu Nagashima passed away on September 10, 2026. He shared his battle with illness on social media under the name "Nagasshi" and also appeared on 24-Hour Television 48. This article summarizes his cause of death, his medical condition, his family (wife Kaho and eldest son Nagi), and his life up to that point, based on publicly available information.

What was the cause of death of Ryu Nagashima? Nagashima, who appeared on 24-Hour Television, died at the age of 28, leaving behind his wife and child.

Ryū Nagashima, affectionately known as "Nagasshi," passed away on September 10, 2026, at the age of 28. He appeared on the 24-Hour Television 48 program and left behind his wife, Kaho, and young son, Nagi. This article summarizes the publicly available information regarding his cause of death, medical condition, family, and television appearances.

The cause of death and circumstances surrounding the death of Ryu Nagashima (Nagasshi)
The diagnosis is small intestine cancer, stage 4 | The meaning of "7 months to live"
Wife Kaho and eldest son Nagi | Family composition
Appearance on 24-Hour Television 48 and tribute to Jun Shison
Nagasshi's profile and list of social media accounts
Frequently Asked Questions (FAQ)

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Q. What was the cause of death of Ryu Nagashima (Nagasshi)?

A. He had been battling small intestine cancer (stage 4). He passed away peacefully at 7:47 a.m. on September 10, 2026, at the age of 28. He left behind his wife, Kaho, and their eldest son, Nagi, who was born in April 2025. Actor Jun Shison interviewed him for 24-Hour Television 48.

1. The cause of death and circumstances surrounding the death of Ryu Nagashima (Nagasshi)

The death of Ryu Nagashima was announced on September 15, 2026, through his Instagram account, on behalf of his entire family. The statement read, "Ryu Nagashima passed away peacefully at 7:47 on September 10."

👉Ryu Nagashima's Instagram

【徹底解説】永島龍さんの死因は？ながっしーの24時間テレビ・妻と子供を残し28歳死去

The cause of death was small intestine cancer (stage 4), which he had been battling. Since receiving her diagnosis in February 2025, Ms. Nagashima has been undergoing chemotherapy and other treatments, documenting her progress on social media under the name "Nagasshi."

In the days leading up to her death, she posted on August 27, 2026, that after going on a family trip in late August, she had to undergo a procedure to insert a tube (NG tube) through her nose due to worsening nausea. This shows that she cherished her time with her family until the very end.

In a statement, the family wrote, "While facing illness, we have cherished our time with family and continued to convey to many people the importance of 'living' and 'family'," and expressed their gratitude for the support they have received.

2. The diagnosis is stage 4 small intestine cancer | The meaning of "7 months to live"

The name of the illness that Ryu Nagashima had publicly announced was: Stage 4 small intestine cancer in In addition, cancer cells spread to the peritoneum. Peritoneal dissemination He also revealed that there is one.

It all started in February 2025. I was rushed to the hospital after experiencing repeated vomiting, and tests revealed I had small intestine cancer. At the time of discovery, it had already progressed to stage 4. Life expectancy: 7 months This explanation was even featured on a television program.

Small intestine cancer is considered a rare disease, with an incidence rate of approximately 1 in 100,000 people. Early detection is difficult, and in many cases, the cancer is advanced by the time it is discovered.

Please note that the "seven months to live" figure is based on the situation as of February 2025. In reality, Ms. Nagashima continued to battle the illness for more than a year and a half after her diagnosis, so this figure does not directly reflect her prognosis.

season	Main Events
February 2025	She was rushed to the hospital after experiencing vomiting and was diagnosed with stage 4 small intestine cancer.
April 25, 2025	Our eldest son, Nagi, was born.
August 30th and 31st, 2025	Appeared on 24-Hour Television 48
August 27, 2026	Post about the procedure of inserting a tube into the nose.
September 10, 2026	He passed away peacefully at 7:47 AM (age 28).
September 15, 2026	Family members announce on Instagram

3. Wife, Kaho, and eldest son, Nagi | Family composition

Ryu Nagashima's family consists of three people: his wife Kaho and their eldest son Nagi.

It was mentioned on the 24-Hour Television program in 2025 that Nagashima and Kaho had "married in July about two years prior," suggesting their marriage took place around July 2023. Kaho's pregnancy was confirmed around September 2024, but Nagashima was diagnosed with small intestine cancer in February 2025, shortly before giving birth.

His eldest son, Nagi, was born on April 25, 2025, approximately two months after the diagnosis. Nagashima has spoken on the program about his desire to live until his son reaches adulthood, and his daily life as a father has become a major theme of his broadcasts. In a segment where Jun Shison visited the family, a scene was broadcast showing them taking photos to leave for their family in the future.

Detailed profile information about Kaho, such as her age and occupation, is not publicly available.

4. Appearance on 24-Hour Television 48 and tribute to Jun Shison

Ryu Nagashima appeared on Nippon Television's "24-Hour Television 48 - Love Saves the Earth -" which aired on August 30th and 31st, 2025. Actor Jun Shison, who served as a charity partner for the program, interviewed the Nagashima family.

Having personally experienced acute myocarditis, a serious heart condition, Shison empathized with Nagashima from his own perspective, having faced the weight of life and death. Despite being diagnosed with stage 4 myocarditis, her positive attitude and determination to fight the disease were conveyed nationwide through the program.

🔗 Jun Shison's Instagram

Upon receiving the news of his passing on September 15, 2026, Shison paid tribute on his Instagram Stories. He wrote, "I was encouraged so many times by Ryu-kun's efforts, his words, and his smile," and "I will never forget what Ryu-kun, who continued to fight, left behind." He concluded by saying, "Rest peacefully in heaven. May he rest in peace."

5. Nagasshi's background and list of social media accounts

Ryu Nagashima was born on July 11, 1998. Before his illness was discovered, Physical therapist She worked in the medical and rehabilitation fields. After her diagnosis, she began using the name "Nagasshi" to frankly share her experiences with small intestine cancer, chemotherapy treatment, and daily life with her family on YouTube, Instagram, and other platforms. She also appeared on TV Tokyo's "Telling the Story of Life" (aired in January 2026).

name	Nagashima Ryu
Activity name	Nagasshi
date of birth	July 11, 1998
old age	28
Previous occupation	Physical therapist
Disease name	Stage 4 small intestine cancer (peritoneal dissemination)
family	Wife Kaho, eldest son Nagi

The following are the social media platforms from which they posted:

YouTube: Nagashima Ryu [Nagasshi @ Living with Cancer]
Instagram: Nagashima Ryu | Nagasshi
X (old Twitter): @nagashi4645

6. Frequently Asked Questions (FAQ)

Q1. What was the cause of death of Ryu Nagashima (Nagasshi)?

A. He had been battling small intestine cancer (stage 4). Peritoneal dissemination had also been announced. He passed away peacefully at 7:47 a.m. on September 10, 2026, at the age of 28.

Q2. When did Ryu Nagashima pass away?

A. He passed away peacefully at 7:47 AM on September 10, 2026. His family announced this on Instagram on September 15, 2026.

Q3. How old was Ryu Nagashima when he passed away?

A. He was 28 years old when he passed away. He was born on July 11, 1998.

Q4. Who is Nagasshi?

A. His real name is Ryu Nagashima, and he is a former physical therapist. He uses the name "Nagasshi" to share his battle with small intestine cancer on YouTube and Instagram, and he also appeared on 24-Hour Television 48.