City: God's Gift Comes to Me

In a world parallel to the earth - Blue Star. Hidehiko Kitagawa, an ordinary high school student with nothing special at all, woke up one morning and found a girl lying next to him. She also said that she had been with Xiuyan all day, so why didn't she know? She then said she had lost her memory. How so? If I can't drive her away, should I take her in? Little did he know that the decision he made that day changed his world drastically. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.