When The Red String Of Fate Gets Tangled (Cell Phone Novel)

From

My mom and I settled in Tokyo. 
For a new life. 

I transferred to the same school as my childhood friend, 
Ryuto. 
Who I call Ryuu-chan. 

My mother started working again in a publisher.
Because of that,
I spent most of my days in Ryuu-chan's house.
It was fine.
Since both of our mothers were good friends. 

 My name changed from
Yukimura Koharu 
To
Yamada Koharu. 

Also, 

My life changed from 

Positive 

To 

Negative