Ryoko Sawatsuji is a 45-years-old housewife living like a ghost in her own home, neglected by her workaholic husband and dismissed by her rebellious children.

On her birthday, a chance encounter changes everything when she meets Luna Nomiya—a charismatic transgender bar owner and a hardcore literature geek with razor-sharp intuition.

With one look at Ryoko’s clothes and a brief conversation, Luna deconstructs Ryoko’s entire life, uncovering a "certain regret" buried for 20 years.

Before Ryoko can protest, Luna whisks her away on a high-speed journey to Osaka to confront her past .

But the trip takes a dark turn when they stumble upon a murder case that looks like it was ripped straight from a classic novel .

Drawing on the works of literary giants such as Sōseki Natsume, Osamu Dazai, and Rampo Edogawa, Luna uses the wisdom of the masters to unravel the truth behind the crime and the tangled human drama surrounding it.

As the mystery unfolds, viewers will discover life lessons hidden within these classic masterpieces.

It’s a journey through past conflicts, choices, and regrets.

This "literary road mystery" will make you laugh, cry, and leave you loving yourself just a little bit more than you did yesterday.