This is the first title by Chelseasoft, a sister brand of MORE. Hikari and Takuto were born on the same day and have been together ever since. Learning how to crawl, graduating from diapers, running their first errands, riding a bike… they were always together every step of the way. That’s what it means to be childhood friends after all. They went to the same Kinomori Gakuen and joined the movie research club. They believed that they would always be close childhood friends forever.
However, one day while they were watching a movie in the AV room, a mysterious girl appeared before them, proclaiming that she was Takuto’s true osananajimi. He was flabbergasted as his osananajimi should be Hikari by his side, but that girl looked exactly like Hikari. Neither of them would give up their position as his osananajimi, so it became a full-fledged competition. How will it affect their fates, along with those of the other members at the club?