Jiang Chen, reincarnated as 'Crimson,' a Yangtze Rouge Fish, binds to the Aquatic Emperor System. He uses Wagner's feedings for resources. Recruits Elder Sage as strategist, gathers fish clans. Defeats Snakehead overlord Blackfang and river king Abyss. Facing electro-fishers, he leads schools, collaborates with vlogger Landon Holt to expose them, averting crisis. Becomes Aquatic Emperor, ruling waters, achieving human-fish harmony and leisure.