PSVITA Software If there is a god in this world. [Limited Edition]

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

One day, Haruka Kitami, the main character, receives a letter.
It was a letter from his past seven years ago.
However, all the words in the line do not make sense.
During his daily life as if it were mischief, he realizes that similar letters have also been sent to Ace, Screw, Kyo and Shuri.
They get involved in various incidents because of the letter.
Then they realize that there may be something wrong with this 『 World 』.
What is the truth of the story hidden beyond the blue sea?
■ Special gift included with limited edition
・ Special booklet "Guidebook for Shichika High School Excursion"
・ Black Post Letter (5 kinds)
・ Drama CD