'99: Kyōfu no Daiō to Hōkago no Megami

Description
The year is 1999, and the apocalypse is real. Two teenagers go about their normal lives at the end of the world. Having fallen for his classmate, Kasumi Kurokawa, the protagonist goes about trying to change his life. This short visual novel takes place in a mixture of "real-world" illustrations, the protagonist's notebook, and a period-appropriate personal digital assistant.