Sakuratetsu Taiwa-hen

In the heart of a bustling metropolis, there stands a small, somewhat unstable-looking house. This is where Sakura Tetsu, a high school student who is anything but ordinary, lives with his family. Tetsu works tirelessly day and night to cover his family's living expenses. Life seems normal enough until one day, people from the future and alien pirates from outer space suddenly appear. The underground kingdom also lays claim to Tetsu's land. Will he manage to protect his property? Or will he give in to the demands of these and other invaders? Yes... chaos and madness ensue! (Source: Aku-Tenshi)