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Double Seven Series 1 is on Dengeki MAGAZINE Volume 28.


Double Seven  is a part of second year refers to the short segments written by Satou Tsutomu released in Dengeki Bunko MAGAZINE in a timeline when Tatsuya and Miyuki reached their second year in First High School.


It is now published in light novel format as Volume 12. This part consists of chapters 1 to 4.