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Congratulations on the 15th anniversary of the Tochuu-Shisha series. From creators who have been active since the beginning of the series to the latest creators, and even creators who are trying out the Tochuu-Shisha series for the first time, we have come together to create a collaboration to celebrate the 15th anniversary. Please enjoy. Medley Single / https://www.nicovideo.jp/watch/sm4077... niconico / https://www.nicovideo.jp/watch/sm4075...