Takopi's Original Sin is a dark and emotional sci-fi manga about Takopi, a cheerful alien from the Happy Planet who comes to Earth to spread joy. He meets Shizuka, a 9-year-old girl suffering from bullying and emotional trauma. After a tragic event, Takopi tries to fix things using time-travel gadgets, but each attempt uncovers deeper pain, broken families, and disturbing consequences. This short series explores heavy themes like abuse, guilt, and the limits of good intentions.