Contract

Lore & Background

The assassin society in Sakamoto Days does not operate in pure chaos. Contracts serve as the connective tissue between the mundane world of convenience stores, schoolyards, and family dinners, and the shadow economy of hired killers. A contract is issued by a client—sometimes a private individual, sometimes an organization—and assigned to an assassin whose rank and skill match the difficulty of the target. The terms within a contract define the scope: who may be touched, what methods are permitted, and what happens if the job fails or the assassin deviates from the agreed parameters.

Sakamoto, once the undisputed number-one assassin known for his unmatched efficiency, walked away from this system entirely. His retirement was not a simple resignation; it meant severing himself from the contract network, the rankings, and the expectations that had defined his life. Yet the system does not forget. Old contracts, old rivals, and old debts still ripple outward, pulling him back toward the world he left behind. His wife Yu, herself a formidable former assassin, shares this history, and together they shield their son Gaku from the machinery of contracts even as it encroaches on their quiet domestic life.

For the younger generation of characters—students, up-and-coming killers, and those drawn into the assassin world by circumstance—the Contract represents both opportunity and trap. To accept a contract is to enter a hierarchy where your life is measured against a target's, where loyalty is transactional, and where breaking the terms can mean consequences far worse than a missed kill. The tension between the personal bonds these characters form and the cold obligations written in their contracts is a central emotional engine of the series.

In Their Own Story

The rain had not stopped for three days. Inside the convenience store, Sakamoto restocked onigiri with the same mechanical calm he once brought to a rooftop in Osaka, except now the only thing he was eliminating was a shelf of expired rice balls. The bell above the door chimed. A woman in a grey coat stepped in, shook the water from her umbrella, and set a manila envelope on the counter. Inside: a contract. A name. A date. A sum that would make a retired man's hands tremble. Sakamoto looked at the envelope, then at his son's homework scattered on the register, then at Yu, who was already reaching for the phone behind the counter. "We're closed," he said, and slid the envelope back across the glass. The woman smiled. "It's not a request, Sakamoto-san. It's a reminder."

Reader's Guide

A Contract in the Sakamoto Days universe is the formal agreement that binds a client to an assassin for the purpose of eliminating a specified target. It is the fundamental unit of the assassin economy: without a contract, there is no job; without a job, there is no rank, no income, and no standing in the hierarchy.

Contracts matter because they impose structure on a world where violence is otherwise ungovernable. They define scope (who is the target, who is off-limits), method (what is permitted), and consequence (what happens if terms are violated). This structure creates the narrative tension of the series: characters are pulled between their personal loyalties and the cold obligations written in the contract's terms.

Sakamoto's retirement represents the ultimate rejection of the Contract system—he left the ranking, the assignments, and the expectations behind. Yet the system persists through his wife Yu, through the younger assassins who still operate within it, and through the clients who believe a contract is an absolute. Cross-referencing: the ranking system of assassins, the role of clients/employers, and the domestic sphere (Sakamoto's convenience store) all exist in constant tension with the Contract's demands.

Did You Know?

• Sakamoto's retirement from the assassin world meant walking away from the Contract system entirely, choosing a life of restocking shelves and watching his son over the hierarchy of kills.
• The Contract system creates a unique narrative tension: the same world where a man can buy discounted bento at 7 PM is also one where a signed agreement can put a price on someone's life.
• Yu, Sakamoto's wife, is herself a former assassin who operated within the Contract system, meaning the couple's domestic life is built on shared history with the very machinery they now try to avoid.
• The Contract system implies a regulated, almost bureaucratic approach to assassination in this world, contrasting sharply with the raw, personal violence that characters still experience when contracts are broken or cont