"The Line" (一線, Issen, Tonari: 193) is the 148th chapter of the One-Punch Man manga series.
Short Summary[]
Bang engages Garou in combat, impressed by his growth during their battle. After a failed attack on Fuhrer Ugly, Amahare sacrifices himself to save Atomic Samurai and Nichirin, who is gravely injured. Nichirin gives Atomic Samurai the Sun Blade before passing out. Meanwhile, Black Sperm merges into Golden Sperm, who then thrashes Fuhrer Ugly for angering him.
Long Summary[]
Bang comments on Garou's sorry state before deciding to fight his former disciple with full force. They engage in combat, matching each other skillfully. In a brief exchange, Garou manages to draw blood from Bang, prompting his former master to note that Garou is now much more deserving of his teachings.
After both fail to injure Fuhrer Ugly with their attacks, the monster unleashes his Full Body Melting Punch at Atomic Samurai and Nichirin in an attempt to eliminate them. As Spring Mustachio and Iaian rush to defend their masters, Amahare sacrifices himself, kicking Atomic Samurai and Iaian out of harm's way while Nichirin pushes his student aside. Amahare is instantly killed by Fuhrer Ugly's acidic punch, and Nichirin suffers mortal injuries, dissolving from the waist down.
On the brink of death, Nichirin activates his mythical pearl to summon the legendary Sun Blade, entrusting it to Atomic Samurai to seek the Moon Blade. He advises Spring Mustachio to follow his own path before losing consciousness, leaving his student heartbroken.
Meanwhile, Black Sperm warns Fuhrer Ugly against consuming his clones, threatening retaliation if he does. In response, the monstrous figure declares he will keep Black Sperm's clones as livestock and consume them as needed, provoking Black Sperm to retaliate. Angered, Black Sperm notes that the heroes have been weakened and begins merging his cells into Golden Sperm, a formidable entity formed from a vast quantity of his cells. Upon emergence, Golden Sperm quickly overpowers Fuhrer Ugly, confidently asserting that the monster's digestive fluids are ineffective against him due to his anticorrosive gold properties.