Hatate Sota is a high school boy, who has an ability to visualize "flags" for future events such as "death flag", "friendship flag", and "romance flag". Despite the flag-viewing ability, he avoids making friends with others due to a trauma he experienced in a ship submergence accident. Four beautiful girls get interested in his strange way of living, and they begin to live with him at the school dorm by force.

Ryouta Oosakaas Souta Hatate
Ibuki Kidoas Nanami Knight Bladefield
Ai Kayanoas Akane Mahougasawa
Kana Asumias Kikuno Shoukanji
Yukari Tamuraas Mimori Seiteikouji
Risa Tanedaas No. 0
Ai Kakumaas Hakua Berserker Bladefield
Aoi Yuukias Serika Ginyuuin
Yuuka Nanrias Miyuki Mackenzie
Ayaka Suwaas Ruri Ninjabayashi