Tobi Tsukihime is a horizontally scrolling shooter developed by 01step and based upon Tsukihime, a doujin visual novel created by Type-Moon.

Tobi Tsukihime is a typical shooting game in which the player takes the role of Kohaku, a maid in the Tohno mansion, along with Len the demon succubus. The player's firepower consists of a main shot (allows for rapid fire), a number of bombs for moderate damage and a spinning marble created by Len. Power-ups are available for the main shot by collecting items or enemy shot down. During level-up Kohaku is invicible for a short of time. The marble plays as an indestructable weapon which can firing forward or moved freely in any direction. By holding down shoot button will gives player hit box icon and reduces Kohaku's speed.