“Danmitsu” is a nonfiction work that depicts the daily life of Seino Tooru and Dan Mitsu, the celebrity he married in 2019. It tells the “truth” about the two, including how Seino and Dan Mitsu started dating, the episodes leading up to their marriage, and their married life afterwards, and explains why a famous celebrity known to everyone and a subculture manga artist known only to a few are a “couple”.