3-gatsu no Lion Volumes 01 to 12 scanlated by HWMN and BWYS.
https://www.mangaupdates.com/series.html?id=13885
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.