Tarou Sakamoto

Taro Sakamoto was once the world's most feared assassin — the name other hitmen said quietly — and he walked away from all of it the moment he fell in love with a convenience store owner named Aoi.

Background

The legend is established before the series begins: Sakamoto was at the absolute top of the assassination world, a figure so capable that his name functioned as a warning across the industry. Then he met Aoi, married her, had a daughter, gained a noticeable amount of weight, and started running the family convenience store. By the time the series opens, he looks like exactly what he appears to be — a cheerful, slightly pudgy shopkeeper who is very good at ringing up groceries. The joke the series builds from is that "retired" for Sakamoto means "choosing not to kill anyone" rather than "no longer capable of doing so." His physical condition is the result of lifestyle change, not ability change: the reflexes, the spatial awareness, the capacity to neutralize threats before they develop into situations requiring force — all of that is intact and available, deployed constantly in the convenience store to prevent shoplifting with choreographic precision. When the past catches up with him through former colleagues, bounties placed on his head by the assassination industry's governing body, and clients who haven't accepted his retirement, he handles it while trying very hard not to get his uniform bloody. His former partner Nagumo Shin, who can read minds, works alongside him and translates his largely wordless communication for people who haven't learned to read him yet.

Skills

Skill	What it does
Combat Mastery	Sakamoto's capability as a fighter is unchanged from his peak — the strength, speed, and precision that made him the industry's most feared name are all present; what has changed is his willingness to apply them lethally, which he exercises carefully
Threat Neutralization	He reads environments and people with the automatic precision of someone who spent years staying alive in hostile conditions; threats are identified and addressed before they escalate, often through methods so subtle that bystanders don't register that anything happened
Non-verbal Communication	He operates almost entirely without words — his expressions, posture, and actions communicate clearly to people who know how to read him, and Shin provides verbal translation for those who don't; this is not a limitation but a style that has been effective across decades

Personality

Entirely committed to the domestic life he chose and entirely comfortable in it — he genuinely loves running the store, genuinely loves his family, and approaches the inconvenience of the assassination world following him home with the same patient equanimity he brings to rearranging the snack display. There is no nostalgia for the old life and no sense that he gave something up. He gave something up deliberately for something he wanted more, and the series respects the clarity of that choice rather than treating it as denial.

Relationships

• Aoi Sakamoto — the wife whose existence prompted his retirement and whose safety is the center of gravity for every decision he makes; the marriage is presented as genuinely happy, which is unusual enough in this genre to function as its own characterization
• Nagumo Shin — his former colleague and current partner at the store, whose mind-reading ability makes him Sakamoto's primary communication bridge and who has accepted the domestic arrangement with the specific resignation of someone who understands exactly why things are this way

Role in the Story

Sakamoto is Sakamoto Days' argument that the most interesting version of a former killer is not one who returns to the life but one who genuinely doesn't want to — who values what he built afterward enough that the violence the story requires of him is always defensive, always reluctant, and always in service of keeping the store open and the family intact.