"3-gatsu no Lion," also known as "March Comes in Like a Lion," is a Japanese manga series written and illustrated by Chica Umino. The story follows Rei Kiriyama, a professional shogi player who struggles with personal and emotional challenges while navigating his career and relationships. The series explores themes of loneliness, family, and the pursuit of happiness. It also highlights the importance of connections with others, particularly through Rei's interactions with the Sakura family, who help him find a sense of belonging and support in his life.