From Viz:
Time has passed peacefully for Sakamoto since he left the underworld. He’s running a neighborhood store with his lovely wife and child and has gotten a bit out of shape. But one day a figure from his past pays him a visit with an offer he can’t refuse: return to the assassin world or die!

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Note:
Nominated for Best Print Manga at the Next Manga Awards in 2021 and the 68th Shogakukan Manga Award in the Shounen category in 2022. Won the U-Next Prize in 2021.