Tetsuharu Kawakami manages the Yomiuri Giants, bearing the revered title "the God of Batting" earned through his exceptional skills and deep game understanding as a former professional player. His own storied career with the Tokyo Kyojin/Yomiuri Giants spanned 1938 to 1958, interrupted by military service from 1943 to 1945. During this time, he captured five batting titles and became Japanese professional baseball's first player to achieve 2,000 career hits.

As manager, Kawakami leads with a strict, uncompromising approach, fiercely upholding the team's tradition of glory and honor. He initially expresses skepticism about recruiting Hyūma Hoshi, citing concerns over Hyūma's high school championship injury. Witnessing Hyūma's exceptional control and pinpoint pitch precision during the Giants' enrollment test, however, changes Kawakami's stance. He permits Hyūma to join and personally awards him the retired uniform number 16, signifying his endorsement and high expectations.

Kawakami shares a complex history with Ittetsu Hoshi, Hyūma's father and a former Giants player. During Ittetsu's playing days, Kawakami condemned his "Devil's Fastball" (魔速球) as a dangerous beanball tactic, declaring it antithetical to Giants' values—a confrontation that prompted Ittetsu's departure from professional baseball. Years later, as manager, Kawakami visits Ittetsu to apologize and acknowledge Hyūma's potential, drawing a parallel to the historical tale of Hōjō Tokiyori's "Hachi no Ki" (The Potted Trees) regarding their father-son legacy.

His managerial philosophy demands discipline and mental fortitude, viewing baseball as a 24-hour commitment extending far beyond the ballpark—a mindset he instills in his players. Under his leadership, the Giants secured nine consecutive championships from 1965 to 1973. Kawakami appears in the anime film *Kyojin no Hoshi: Dai League Ball* (1970) within the franchise's theatrical releases.