
Taro Sakamoto was once the world's greatest hitman, feared by villains and respected by fellow assassins. After falling in love, he retired from the assassin life, got married, had a child, and gained weight. Now running a neighborhood convenience store, Sakamoto still possesses his legendary skills and uses them to protect his family and peaceful life from the dangers of his past.

Sakamoto Days follows the daily life of Taro Sakamoto, a legendary hitman who retired after falling in love. Now overweight and running a neighborhood convenience store, Sakamoto must protect his family and peaceful life from the dangers of his past. Despite his changed appearance, Sakamoto still possesses his incredible skills and reflexes, allowing him to defeat enemies while maintaining his cover as a simple shopkeeper.

A young clairvoyant assassin who can read minds within a certain range. He becomes Sakamoto's employee at the store and loyal companion after Sakamoto saves his life.

A skilled female assassin with incredible martial arts abilities. Initially sent to kill Sakamoto, she ends up joining his team after witnessing his skills and compassion.

A former colleague of Sakamoto from his hitman days. Despite being retired, he occasionally gets involved in Sakamoto's adventures.