Lion-Maru G is a Japanese tokusatsu series that aired from October 1, 2006 to November 24, 2006 in Japan, lasting 13 episodes. It is the third part in the Lion-Maru trilogy, following Kaiketsu Lion-Maru and Fuun Lion-Maru. The "G" is short for 'Ghetto'. This Lion-Maru is called "the Beast Transformed Gigolo Warrior".

Having been demoted for failing to prevent the murder of one of his superiors, Mondo is startled by a group of masked thugs who are soon attacked in turn by an unseen force. He begins to suspect the work of assassins, but whose side are they on?

Kenichi Nonoyama, a new teacher at Seiun Academy, is late on his first day. To make matters worse, he falls for a student's prank and loses face completely. After getting into a brawl, he is appointed advisor to the weak soccer club. Meanwhile, Shiina, a 42-year-old who has failed his entrance exams and is now 60, is invited by Kenichi to join the soccer club.

A group of seemingly ordinary merchants is really a band of assassins for hire. When they discover that all the assassins in Edo are being killed they must act quickly to find the culprit.

When the Shogunates greatest secret is stolen, the fate of the nation hangs in the balance. The Shogunate sends an incompetent cop, Tanaka, to Kyoto to act as a stalking horse. Hoping the thieves will kill Tanaka and the Ninja Spies will kill the thieves. But what the Shogunate doesn't realise is that Tanaka's even more incompetent assistant Mondo is in fact the leader of a gang of revengers for hire, there motto is "Sure Death" (or your money cheerfully refunded). Mondo doesn't know that everyone knows about the secret, but they all think he does. Poor Mondo, he not only has to deal with crazed Shogunate extremists, oddball ninjas, crooks who work for the Emperor and bicycle riding foreign death squads. He also have to deal with a wife and a crazy mother-in-law!

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Mitsubayashi, who works for Iwasa Construction, watches a horror movie with his girlfriend Chizuko, then joins friends at a gathering. Kagamiko, a travel planner, organizes a horror tour with Yashiro, a psychic researcher. The group includes friends Hatoko, Saori, and Mitsurin, who’s engaged, along with Iwasa Construction’s president and managing director. The next day, Mitsubayashi’s body is found, drained of blood, and Lieutenant Amemori investigates. He learns Mitsubayashi had been near haunted Hirozawa Pond, where Yashiro shares ghost tales from the Heian period. Later, Chizuko dies in a similar, eerie manner. Ghosts tied to the Tengu of Atago-yama warn Kyoko, Hatoko, and Saori about strange events. Chizuko and Mitsubayashi’s deaths resemble vampire attacks, linked to the vengeful spirit Shuhime. Kagamiko, Hatoko, and Saori search Mitsubayashi’s ransacked apartment while being spied on. Hauntings intensify, revealing a spirit named Mayumi as Princess Akemi’s ghost.