Midori Tsukimiya

A huge sphere suddenly began to emit a mysterious spiritual wave to the Tengu City that should have regained its peace. A mysterious, beautiful girl showed up at the same time. Silently, what is her purpose to cast her line of sight to Shidou and the others? The real purpose is...?

An OVA for R-15 bundled with the tenth volume of the novel.

Noya Itsuki just transferred to Ebisugawa High School. Since he has always had a fascination with space, he decides to join the Astronomy Club; however, he mistakenly walks into the Asstronomy Club-a club whose members are all female otaku. Itsuki notices that the members are really weird, but he has yet to realize that he joined the wrong club. His life becomes very strange very quickly.

Ayumu was murdered by a serial killer and resurrected as a zombie by a cute little Necromancer. Then he got mixed up with a magical girl and a vampire ninja! With a harem like this, Ayumu could end up even deader before figuring out who killed him!

At a school full of geniuses from varying fields of study, Taketo Akutagawa has a special – albeit different – genius as well: writing harem novels. Now amongst the other geniuses, he aims win the interclass competition and be recognized as the world’s greatest harem writer.

Thirty years ago a strange phenomenon called a "spacequake" devastated the center of Eurasia, claiming the lives of at least 150 million people. Since then, smaller spacequakes plague the world on an irregular basis. Shido Itsuka, a seemingly ordinary high schooler comes across a mysterious girl at the ground zero of a spacequake and learns she is one of the "Spirits" who are the real cause of the spacequakes that occur when they manifest themselves in the world. He is recruited to make use of his mysterious ability to seal the Spirits' powers thus stopping them from being a threat to mankind. However, there is a catch: to seal a Spirit's power, he must make her fall in love with him and kiss him.