Grope: Yami no Naka no Kotori-tachi

School at the height of the school day. Earthquake. Ruins and four survivors. Two boys and two girls. One of boys " bad " (more precisely lustful) forces at first one, then the second girl to sex. But they both like a "good" boy, so they are slightly-slightly resisting the insidious villain, along the way, a little bit tormented by remorse. And nothing that around continuous ruins, crushed stone and broken glass that exits and ladders filled up that there is no food and water, and in piles of stones corpses of classmates are seen. We're watching hentai. Drama about losing your virginity...