Lotto 6 de San-oku Ni-senman En Ateta Otoko

Satoru Tachibana is an advertising firm employee slaving away under a younger boss for a meager salary. With a pachinko habit, no savings, and no prospects of romance since his divorce, Tachibana is left wondering what the future holds for him. One day, he desperately enters a lottery, trying to make enough money to pay for his child support, but his sense of self-disgust kicks in. However, his curiosity gets the better of him, and he later discovers that the ticket is a winner, turning him into a millionaire overnight.
(Source: Tokyograph)