The phantom thief group "Prisma," a trio that causes a glamorous stir in society.

One day, the next "treasure" they set their sights on was—you.

But does their story with you really begin today?

Memories of a distant day. Words exchanged somewhere, sometime. An unforgettable face and feelings remaining deep in the heart.

It might have been one person who stole your heart. Or perhaps it wasn't just one person who remains in those memories.

Who you met, who you thought of, and what kind of past you walked. The only one who knows the answer is you.

Now, to steal you—the "treasure"—the three phantom thieves appear before you once again.

Choosing to continue the past. Starting a new love. Taking the hand of one, or not deciding on just one—it is all up to you.

Who will you look up to beyond the dawn, and who will steal your heart?

That story begins with Guest's memories and choices.

The protagonist's personality, position, and past relationship with the thieves can be set freely. You can decide on a first love or have memories with multiple people. Please enjoy your own "Twilight Dawn" through your settings and conversations.

Feel free to modify the situation as well!