Minakami attended Keiō High School and played on the school's baseball club. While attending Keio University, he was inspired by the works of Kyōka Izumi and by a newly appointed professor, Kafū Nagai, who was also the founder of the literary magazine Mita Bungaku, launched in 1910.
Minakami attended Keiō High School and played on its baseball team. While studying at Keio University, he was influenced by Kyōka Izumi's writings and a professor named Kafū Nagai, who also founded the literary magazine Mita Bungaku in 1910.