In the center on a metropolis city lies a small, shaky-looking house. A normal... Okay... Not so normal high school student, Sakura Tetsu (and his family), who works day and night relentlessly to support his family's living expenses, lives there. All is normal until one day, people from the future, alien pirates from outer space, appear. The underground kingdom claims Tetsu's land. Will he prevail in protecting his own land? Or will he surrender his land into many more invaders to come? Yes... Weirdness and insanity ensues!

[From Aku Tenshi]:

The world of Waq Waq is a place where machines attack the black-blooded humans, whose only defense are the Sakimori, humans chosen to partner up with the Goujin-zou, a race of machines that grow stronger when melded to humans. Shio and his Sakimori father, Al, upon entering a village, are attacked by the machines. As Al falls in battle, he leaves his son to become the new Sakimori and guardian of a mysterious young girl, believed to be god, found at the heart of the battle. Waq Waq is the story of Shio as he battles to protect what was entrusted to him by his father. Let the battle for God begin!

A young man who dreams of becoming an astronaut is struck by a truck and has an out of body experience that forces him to question reality. His two friends race against time in an attempt to save him.

Once, there were two worlds that existed on this earth. In the sky where the deities lived was the Senninkai. On the ground where, of course, the people lived was Ningenkai. In the novel adaptation by Ryu Fujisaki, Houshin Engi follows Taikoubou on his mission to rid the Ningenkai of the evil immortals that have resided there. This colorful historically set manga keeps the reader on their feet and loving every minute of the in-depth characters and exciting adventures

A compilation of five short stories by Ryu FUJISAKI written throughout his career. Ranging from fantasy to gothic horror, they explore the fantastic worlds contained within the mind of the mangaka of such series as Houshin Engi and Waq Waq.

From Inane scanlation notes:

Dramatic Irony has 4 different short stories. The first short story is Dramatic Irony, the second is Yugamism, the third is Milk Junkies, and the last is the Houshin Engi special.