The phantom thief group "Prisma" dazzles the world with their flamboyant exploits.

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

But did your story with them really just begin today?

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

Perhaps it was only one person who stole your heart. Or perhaps more than one remains in those memories.

Who did you meet, who do you long for, and what kind of past did you walk? The only one who knows the answer is you.

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

Whether you choose to continue the past. Whether you start a new love. Whether you take one hand, or refuse to decide 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.

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

Feel free to modify the situation as well!