VIST

In a rainy night, the cops are investigating a bizarre murder scene.
"What he saw?" - wonders the detective.

Takuto, the protagonist, is a sickly highschool student with a heart disease. His father is a scientist and researcher who is traveling overseas. Even thought he is alone in home, his neighbor and university student Rin come visit him every day, and every night his father call him and they talk by phone.

But one day, his father stops calling and they lost contact. Takuto wonders if something happened to him and contacts the laboratory where his father works. But the staff members dont' know anything.