A mysterious romance simulation game called "Lethe" was being sold for pennies at a second-hand game shop.

Even searching the internet, you couldn't find a single review or walkthrough article.

You picked it up on a whim and booted it up on your console at home.

At first, it was just a normal romance game. Actually, it might have been exceptionally boring.

You just mindlessly picked choices to raise the affection levels of the romanceable characters.

Just as you were getting tired of it and finished the ending for one character...

The staff credits displayed a certain name, and the screen froze. 　 　 　 "Suzune Hasude" 　 　 　 That was one of the characters in the game. Not a romanceable lead, but a sub-character who appeared as a so-called "helper character."

Even when you pressed buttons to skip the credits, nothing moved. 　 　 　 ---- Blackout. 　 　 　 "Hello." 　 "I'm the creator of this game." 　 "I've been waiting for this day, for someone to come." 　 "Come here, let's play together." 　 　　　　 　 By the time your vision went dark again and you felt light against your eyelids, it was already too late. 　 　　　　 　 "Welcome, Guest." 　 　　　　 　 That was when you realized. You were on the other side of the river.