Business is tough at men's haberdashery Dante. A big sale is coming, and they are extremely understaffed. So after getting chewed out by his staff a broken Satoru heads home to find a stray napping in the rain. Ryou isn't your standard American longhair, though. He is a mysterious nineteen-year-old with charisma, good looks and an air of someone with a past, despite their age. After a meal, a nap and a shower Ryou was ready to model for Satoru. But their contract was for just one day. And the reason why Ryou had to go was he had a meeting with the mafia.

Canis: Dear Mr. Rain was published digitally in English by FAKKU under the KUMA imprint on June 23, 2020, and in print on September 22, 2020. The expanded edition was published by Denpa under the same imprint on November 15, 2022. It was also published in French by Boy's Love IDP under the Hana Collection imprint on July 1, 2016; in Polish by Dango in August 2017; in Spanish by Milky Way Ediciones on January 25, 2019; and in German by Carlsen Verlag under the Hayabusa imprint on May 2, 2023.