Aya and her twin brother Aki thought they were going to a celebration of their sixteenth birthday at their grandfather's home, but the funeral-like atmosphere tips them off that something's not right. Their ...

The main girl's older twin brother is an enhanced human. People like him are genetically engineered as a human survival project. She is constantly being compared to him and is always trying her best to catch...

Chica is packed away to sleep in an escape pod in order to avoid a deadly asteroid collision on Earth. When she wakes up, however, she finds herself in the distant future, but still on Earth. Earth is now fi...