式神 ～桔梗の華に秘めたる想い～

There is a city, which has two different faces. The city is filled with people during day, and a monster called "Hizumi (strain)" appears during night. Tsukasa is "Shade", who protects this world from the monster with his sword. The unescapable fate awaits him....

[From ErogeShop]

Combat sequences in this story are played as card-game battles.