Oya Naru Mono Dangai
The story begins in 1927 (Showa 2) when four girls between the ages of 11 and 16 were sold to the Bakunishi brothel in Muroran, Hokkaido. Against the backdrop of the social conditions of the time, the girls' tumultuous lives are depicted.
(Source: Natalie.mu, translated)
Note: Winner of the 21st Japan Cartoonists Society Award for Excellence in 1992