Junpei, Think Again (2018)

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Twenty one year old Junpei is a low ranking Yakuza who is one day given the mission to kill a high ranking yakuza from a rival gang. Wanting to up his standing in his gang, he accepts. Junpei meets OL Kana and they spend the night together. Afterwards, he tells her about his mission. She gets both concerned and excited, staying with him until the day he carries out his mission.