Omorai-kun

Whoever wins... we lose.

Maka Kikkai is an elementary school student who calls himself a handsome boy on the cutting edge of scientific civilization. He tries to live a comfortable and convenient life with the help of his tutor Mashin Hakase's, and his father's inventions, but he always fails and causes a big ruckus. Note: Chapter and volume count is based on the 1973 Sun Comics edition which was the first complete compilation of the series

September 11, 197x, In the whole Kantou region a magnitude 8-9 violent earthquake occurred. Scholars called it the great destruction of the Showa Era, but the people called it the earthquake from hell! Volcanoes erupted, buildings crumbled, Tokyo became decimated in a single day. The government, after failing to recover the city, abandons Tokyo and moves the capital. The survivors form a society with no laws. In this harsh lawless world emerges Jack, a 10 foot giant who annihilates anyone and anything in his path. The manga details his journey.Note: This was the serialization in the magazine Weekly Shounen Magazine and Monthly Shounen Magazine.

A Violence Jack one-shot from 2001. What happens when Jack and some bikers mysteriously get sent back into the age of samurai.