忘れないでおとなになっても is a cinematic adventure game developed by GAGEX Co.Ltd. This game takes place in a beautiful and nostalgic town that will make you sigh with longing for the past. It follows the story of a young boy named Minato and his mysterious summer adventure.

In the prologue, Minato visits a small town called Kagami with his mother and sister. He has a secret plan to find his father, who should be in this town. He believes that if he can meet his father, he might be able to save his sick sister and his mother, who is fighting a lonely battle with fate.

Minato finally finds a clue left by his father, a mysterious notebook called the "Seven Mysteries Note." Guided by the notebook, Minato embarks on a far and treacherous journey. His destination is Kagami, the town where his parents met 33 years ago. However, this town is in the past!

Will Minato be able to change his fate and reunite with his lost family in the past world? Play the game to find out!

The main story of 忘れないでおとなになっても is completely free to enjoy until the end.