Touch, Shot! Love Application

A piece of mail that arrived at a boy's house. The mail of unknown sender contained a smartphone equipped with a function to understand the destined person, a function to read the mind, and a function to embody delusions. It seems that he was selected as a test user of the smartphone model "yPhone", but when he started the smartphone with half confidence, four fateful girls were found at the initial startup.

The main character is an ordinary boy who attends a private school.
One day, one piece of mail arrived.
Inside the parcel of unknown sender was a black smartphone...