Seikin Biography: Age, Wife, Kids, Net Worth, YouTube Career, Songs & Albums, Height, Nationality

Seikin is a Japanese YouTuber and singer-songwriter who rose to prominence through his high-energy variety content and musical collaborations.

He first gained attention in 2012 with the launch of his channel SeikinTV, combining humor with music to create entertaining vlogs that resonated with a wide audience. He also frequently collaborates with his younger brother, Hikakin.

As part of the duo HIKAKIN & SEIKIN, he produced popular singles including the YouTube Theme Song, which became a staple among Japanese youth.

Quick Facts

• Full Name: Seiya Kaihatsu
• Nickname: Seikin
• Date of Birth: July 30, 1987
• Age: 38 years old
• Gender: Male
• Place of Birth: Myoko City, Niigata Prefecture, Japan
• Nationality: Japanese
• Profession: YouTuber, Singer-songwriter
• Eye Color: Dark Brown
• Hair Color: Brown
• Parents: N/A
• Siblings: Hikaru Kaihatsu (Hikakin)
• Spouse: Pon-chan
• Children: Chibikin
• Relationship Status: Married
• Religion: Shinto/Buddhism
• Ethnicity: Japanese
• Net Worth: $10,000,000

Early Life and Education

Seiya Kaihatsu (39 years old) was born on July 30, 1987, in Myoko City, Niigata Prefecture, and grew up alongside his younger brother, Hikaru.

During his youth, he participated in extracurricular activities such as playing the trombone and performing in an a cappella group.

He was also an active member of his high school ski club, achieving fourth place in the Inter-High School Championships.

After graduating from Arai High School, he enrolled in the School of Literature at Senshu University but left before completing his degree.

He briefly worked for an electric power company before committing fully to a career in digital media.

Personal Life

Seikin married his wife, Pon-chan, on December 25, 2014. She occasionally assists with his video production and sometimes appears on camera, though her identity is largely kept private.

The couple welcomed their first child, a son affectionately nicknamed Chibikin, on April 12, 2018.

His professional and personal life remains closely tied to his brother Hikakin, with whom he continues to collaborate on musical and online projects.

Career

Seikin began his professional YouTube career on March 2, 2012, focusing on original music and singing, inspired by his brother’s success.

He joined the UUUM multi-channel network at its inception and expanded his content to include gaming through the SeikinGames channel.

As part of HIKAKIN & SEIKIN, he released multiple singles produced by TeddyLoid and developed a signature variety style that includes experimental challenges, “try” videos, and product unboxings, collectively garnering billions of views.

Net Worth

Seikin has an estimated net worth of $10 million, earned through YouTube ad revenue, brand sponsorships, music sales, streaming royalties, and merchandise.

His position within UUUM provides access to high-profile commercial opportunities in Japan’s creator economy.

Social Media

• Instagram: @seikintv
• X: @SeikinTV
• TikTok: @seikin_official
• YouTube: @SeikinTV

Discography

• YouTube Theme Song (2015)
• Just Do It Now (2015)
• Keep Your Head Up (2016)
• Zasso (2017)
• Ima (2018)
• Yume (2019)
• Hikari (2021)
• FIRE (2021)
• Call (2024)