Watch Online Free on Watchseries. RIZIN 18 live from the Dolphins Arena in Nagoya, Japan. In the evening’s main event, former UFC title challenger and current Rizin and Bellator champion Kyoji Horiguchi takes on rising star Kai Asakura. The co-main event pits the promotion’s women’s super atomweight titleholder Ayaka Hamasaki against Thailand’s Suwanan Boonsorn in a non-title affair.