Tenma Shoujo Rena -Hatsujou Mahou no Astral Charm | 天魔少女レナ -発情魔法の星紋陣-

The celebrity the Tenzaki in downtown in Tokyo, lineage that succeeded to "Demon's supernatural power" from generation to generation. Protagonist Atsuma, it is received as an adopted son by such Tenzaki. Though it is puzzled to the sudden occurrence, thanks to Rena that became the younger sister and cousin Chizuru, it has gradually become accustomed to a new life.

And when three years pass, Atsuma will learn the existence of "Back" to grasp Tenzakis secret. Rena, it is because of awaking to demon's supernatural power. Though the power that fought as the demon was gained, Rena is violated by "Demon's curse" that presses the gender sexual excitement at the same time. Atsuma that piles up the sister-in-law, Rena and the body though it hesitates, the role to calm down her exciting safely is played. However with puzzled of oneself, Atsuma cannot stand suffering of Rena any longer, it groped for the method of saving her.

One day ―― Before two, the demon Oboro that initiates the supernatural power into Tenzaki appears. Her purpose, collection of supernatural power that piles up generation and became strong. Even if Rena is killed, it immediately attacks it. Though it barely succeeds in the repulse because of fighting with the first demon, two were not able to hear the method of solving the curse.

In fighting with Oboro in addition, the curse that has strengthened afflicts Rena. It becomes horny regardless of the place, Atsuma is every day when it answers the request to soften the suffering. To save Rena, Atsuma it was determined to face Oboro that was the main cause again.