Mishima is your average spineless pushover, working as a repairman for the Exopolis Tower, Tokyo's largest and hottest highrise business and entertainment building. He promised to come home in time to celebrate his son's birthday, but when he lets his pushy boss saddle him with overtime, the task takes him all night. On the morning subway train heading home, a massive earthquake strikes and collapses both Exopolis and its underground train lines. Now Mishima is trapped deep underground with the other passengers of the train, some of whom are less than cooperative. Will he be able to take the initiative for once and lead them all to freedom, or will they starve in their underground prison?
(from the back of the first book)

The month is February, but it hasn’t snowed all winter. Kanon’s father is often away on business trips and might be getting a little too friendly with his pretty young female subordinate; which Kanon doesn’t approve of so soon after her mother’s death. Her little brother collects insects, but they’re dying off.

It turns out that these deaths are the first of many a plague to come down. First it’s the insects, inexplicably dropping dead everywhere. Then it’s the rats, looking for a new food source. And things just keep getting worse…

Man is having a hard time finding food and getting rid of their trash, so science comes up with a bio-engineered animal that survives by eating trash, and is then killed to feed humanity. But the self-replicating, endlessly hungry killing machine gets loose in Tokyo...

There was a fire. Kousei lost his mother, his father and his precious little sister, Sanae. One month later he woke up to find himself in a hospital and was moved to pediatrics where he could share a room with other boys his age.

Professor Kimishiro is loved and respected by his students, but disliked by faculty and administration. He's pushed from his classroom by university politics and takes a team to the jungles of the Amazon in search of new medicines and perhaps a chance to gain back his reputation amongst those with influence back home. Instead of cures, his team stumbles upon a lost temple in the jungle, a place the village guides claim to be 'The House of the God of the Black Death'. What are the temple's secrets, and can any man, let alone a mere boy, survive the plague of an angry God?