Results 2 results found Koinobori, or carp streamers, are seen throughout Japan around Children's Day, May 5th, Japan. Koinobori, or carp streamers, seen throughout Japan around Children's Day, May 5th, Japan Carp streamers on Boy's Day celebrated on 5th May at Asakusa Kannon Temple, Tokyo, Japan, Asia Carp streamer (koinobori) to celebrate children's festival on may 5 in front of Mount Fuji at sunset, Tokyo, Japan