The protagonist had a dream where he met his girlfriend. He woke up only to find a goddess of love besides him. The goddess gave him a database of girls that he could capture by raising flags called the "Onago" database.

This game features customization (separate from main-game) where players can create their own heroine. There are large numbers of traits that can be selected, including traits similar to other anime characters. Players can view and use their customization data by opening up the Onago Database. Said heroine can be used by other players through online mode.

[translated/edited from KAORI Nusantara]