Heisei Ishingun
On July 26, 2017, Hase returned to the ring at a Pro Wrestling Masters event, produced by Keiji Mutoh. Wrestling his first match in 11 years, Hase teamed with Riki Choshu and Tatsumi Fujinami to defeat The Great Muta, The Great Kabuki and TNT in a six-man tag team match. On August 5, 2018, Hiroshi Hase was revealed as the special partner of Riki Choshu and Jun Akiyama on an All Japan show, victorious against Naoya Nomura, Yoshitatsu, and KAZMA SAKAMOTO. His last match to-date came later that month on the 21st, as he teamed up with Taiyo Kea, Shinjiro Otani, and Jinsei Shinzaki for a special one-night BATT reunion on Keiji Mutoh's Pro Wrestling Masters; defeating the Heisei Ishingun team of AKIRA, Akitoshi Saito, Shiro Koshinaka, and Masashi Aoyagi.