Masami Iwaki anchors third base for Meikun High School's baseball team, wearing jersey number 3 and commanding the cleanup position in the batting order. His style blends powerful hitting with dependable defense, though his speed on the bases lags. Iwaki swings aggressively at the plate, even chasing pitches beyond the strike zone—a tendency that earned him nicknames like "the bold bastard of bad ball-striking" and cements his status as Meikun’s fearsome power hitter. Off-field, his bold, talkative personality fuels comedic moments through expressive antics. A distinctive artificial leaf adorns his head daily, applied each morning and removed nightly; it humorously "blooms" during peak physical condition. Romantically linked to Natsuko Natsukawa, he remains a core member of Meikun’s "Four Heavenly Kings." Before joining Meikun, he played at Takaoka Middle School alongside Taro Yamada and Kazuto Tonoma, with all three recruited for their baseball prowess.