"Master and Disciple" (師と弟子, Shi to deshi, Tonari: 195) is the 150th chapter of the One-Punch Man manga series.
Short Summary[]
Garou and Bang clash as Garou adopts Exploding Heart Release Fist, a martial arts style Bang had sealed away after his reckless past as a ruffian. Bang reveals Garou learned the style by breaking into their dojo. Despite memories of his former self, Bang fights fiercely, determined not to lose. Meanwhile, Genos and Tatsumaki struggle against Black Sperm, with Genos choosing to protect Tatsumaki instead of self-destructing, despite overwhelming odds.
Long Summary[]
Garou and Bang continue their battle, with Garou adopting the Exploding Heart Release Fist stance, a martial arts style Bang once used before developing Water Stream Rock Smashing Fist. Both Bang and Bomb are taken aback, prompting Bomb to question how Garou learned the style, which Bang had long sealed away. Bang explains that Garou had previously broken into his dojo's safe and accessed the scrolls of secret techniques. Although Garou's use of Exploding Heart Release Fist evokes memories of his former self in Bang, he remains resolute not to lose.
As Bang's backstory unfolds, it's revealed that he was once a reckless ruffian, challenging strong opponents and frequently sending them to the hospital. Disturbed by his brother's violence, Bomb confronted Bang to put an end to his destructive behavior. Before their clash, Bomb pointed out that while Bang believed he had gained significant strength, he had not overcome his inner conflicts, and he intended to teach Bang a lesson. Their fight ensued, with Bomb ultimately defeating Bang. As Bang attempted to retaliate, Bomb advised him to cool off before departing. This defeat humbled Bang, leading him to recognize his mistakes. He opted to develop a new defensive fighting style and followed Bomb's example by establishing a dojo. Over the years, Bomb monitored Bang’s progress, visiting his dojo and taking pride in his brother's transformation.
Returning to the present, Bomb recalls his memories of Bang and realizes that his brother is struggling against Garou. He speculates that if Bang resorts to the Exploding Heart Release Fist, he might regain an advantage. However, Bomb quickly deduces that Bang won’t use it as he’s being pushed back. Bang, feeling the pressure, tells Bomb to watch closely as he fights, striving to connect with Garou through the force of his fists. He resolves to abandon his hero role after this encounter and expresses a desire to reclaim his position as Garou’s mentor.
The scene shifts to Genos and Tatsumaki, who are fiercely battling Black Sperm, who overwhelms them with countless copies and even tears off Genos' limbs. Tatsumaki urges Genos to flee, asserting he has no chance of victory. In his thoughts, Genos reflects that his former self would have self-destructed in this dire situation, risking the lives of other heroes, but now he refuses to do so, choosing instead to protect Tatsumaki with his damaged body. As Black Sperm taunts Genos, asking if he can crawl any faster, he suddenly hears the roar of King Engine from King.