A youth named Kiriyama Rei, who lost his family as a child, endures loneliness to become a professional shogi player. Then, through a chance meeting, he develops a relationship with the three Kawamoto sisters (Akari, Hinata, Momo), who hail from a working-class district of the city, and little by little his frozen heart begins to thaw.

Note: Nominated for the 2nd Annual Manga Taishou in 2009 and won the award in 2011.

Won the Kodansha Manga Award in the general category (shared with ) in 2011 and won the Grand Prize of the 18th Tezuka Osamu Cultural Prize in 2014. And won the 24th Japan Media Arts Festival Awards Grand Prize in 2021.