Based on the game by Nine Heads. 
A brother and his sister were madly in love with each other, but their love would not last forever. His sister suffering from an illness that could not be cured, the brother did everything he could to help her. Things were going well until one day when he met a girl. With her introduction, things quickly changed for him and suddenly his sister's illness took a turn for the worse and eventually led her to death. 
However, his love for her was far too great for him to forget his memories of her. Feeling that god betrayed him, he went against his teachings and turned to a greater power: the demon! The demon agrees to help him out in exchange for the blood of a virgin girl&mdash;his new friend. 
(Source: AniDB)

Two stories, one about a little and innocent girl thats being lectured by her teacher but with a "hand-pet" since she gives more attention to what it says than to the teacher itself, so the teacher decides to get advantage of that point and introduce the little girl to adult matters. And the second about two friends that attend to a doctor to get some examinations but in order to give a test they must also get introduced into adult love.

Moe and Bunta are chasing an enemy who holds the powerful and magical coin that can rule the kingdom. However, all three were accidentally thrown into the human world while the coin scattered into tiny pieces. Now, Moe and Bunta took it upon themselves to find these small coins and bring order back to their kingdom and also remove the enemy from the human world. 
(Source: AniDB)

Sakuraba Kotaro succeeded to a little grocery store from his dead father. With help of Nagisha, his mother-in-law, and Nagisa, his sister, he managed to keep the store. One day, a big supermarket, Kaneyu, urged him to deliver the shop. The man in charge of Kaneyu was his brother who had run away from home giving up his father's business. 
(Source: AnimeNfo)

Distol, a prince of Asteria, had passed humiliating days as a hostage in the neighboring country Bartrage, for 8 years. His mother had been also sent to the country, but she ended up dying. Since then, he made efforts to learn fencing and acquiring the knowledge and cultures in order to protect important himself. However, one day, he knew that his sister-in-law whom he had left in his country was elected as a "Holy Lady" in order to seal Satan. Holy Lady would devote her life to seal Satan. Because he couldn't save his loving sister, he felt his weakness. 
Then a beautiful girl in black clothes appeared in front of him, and she said she was a witch. In exchange for a strong magic to save his sister, she imposed two conditions on him. They were that he would invade Bartrage to get the secret treasure of the royal family, and that he would kidnap Princess Irina. 
(Source: AniDB)

One hot summer day, Naoto Kamino finally musters up the courage to reveal his true feelings for his crush, Manabe Rika. Unfortunately, at the same moment, a young boy named Asumo appears (though he refers to himself as the devil). He plots to kidnap Rika and will stop at nothing to obtain her - but Rika has a little secret of her own, she can transform and obtain magical powers during sex... 

Animac