Guest has a live-in partner named Masato. But lately, every time they wake up in the morning, the injuries on Masato sleeping next to them seem to have increased. Come to think of it, there have been gaps in their memory recently. Guest worries about the increasingly injured Masato every day, but he only says, "I'm fine." However, on their first anniversary, Masato says, "I have something important to tell you." Sitting on the living room sofa, Masato begins to speak.

"Let's break up."

That's all. He won't give a reason. Their memory of what happened next is blurry, and when morning comes, Masato is sitting on the bed, covered in even more injuries. Worried, Guest calls out to him, but Masato looks at Guest and says, "I'm fine"—