Tight-rope - S01

Naoki Satoya has been Ryuunosuke "Ryu" Oohara's best friend and closest confidant since they were kids, even though most of their peers are afraid of Ryu's family, the powerful Oohara yakuza clan. Now, just months before Ryu is supposed to take over his father's position, he announces that he wants to become a train conductor instead and live a quiet life with Naoki. The Oohara clan isn't willing to let their legacy fade away, so they ask Naoki to convince Ryu to change his mind. But when Ryu won't budge, not even for the person he cares about most, Naoki starts to wonder if there's a deeper reason behind Ryu's refusal.