Makeinu to Lion

Riku is an ordinary university student whose life is shattered when his long-term girlfriend is callously taken from him by another man. Left heartbroken and stripped of his confidence, he finds himself at rock bottom, feeling like nothing more than a defeated stray. However, his downward spiral is halted by an unexpected encounter with Yuji, a charismatic middle-aged man who sees untapped potential beneath Riku’s despair. Taking the devastated young man under his wing, Yuji becomes his mentor, guiding him through a rigorous personal transformation. Under this seasoned man's tutelage, Riku begins to shed his identity as a helpless "loser dog," learning how to rebuild his self-worth and reshape his entire demeanor. The goal is not merely recovery, but a complete evolution into something far more commanding. Determined to never be victimized again, Riku sets his sights on becoming the ultimate lion—the undisputed king of beasts in the realm of romance and charisma. His journey from a broken-hearted student to a figure of absolute confidence marks the rise of a new kind of man. Set against the backdrop of modern society, this story chronicles the dramatic birth of a legendary playboy for the Reiwa era.