is a Japanese international rugby union player who plays in the prop position. He currently plays for the in Super Rugby and the Toshiba Brave Lupus in Japan's domestic Top League.
Born and raised in Yamanashi, Asahara played rugby through school and university. He signed up with the Toshiba Brave Lupus in 2010 and has been a regular with them ever since.
Asahara was selected as a member of the first ever Sunwolves squad ahead of the 2016 Super Rugby season. He played 14 matches in their debut campaign.
Asahara played 5 matches for Japan in 2013, making his debut for the Brave Blossoms on 20 April in a match against the Philippines. He has not played for his country since June 2013.