sentences:  Koshinaka lost the title to Takada on May 19, 1986, but regained the title exactly four months later on September 19, 1986.While reigning as IWGP Junior Heavyweight Champion, he formed a tag team with Keiji Mutoh in a bid to win the IWGP Tag Team Championship, which was vacated by Tatsumi Fujinami and Kengo Kimura in February 1987.On March 20, 1987, Koshinaka and Mutoh defeated Takada and Akira Maeda to win the vacant titles, making Koshinaka a double champion, but the tag team title reign didn't last as he and Mutoh lost the titles to Takada and Maeda in a rematch nearly a week later, on March 26, 1987.