Rukiya Anpo is confronting the harsh lessons from his ONE Championship debut with remarkable honesty and introspection.The 30-year-old former K-1 champion suffered a unanimous decision loss to three-time Glory kickboxing world champion Marat Grigorian in their featherweight kickboxing clash at ONE 173: Superbon vs. Noiri on Sunday, Nov. 16, inside Tokyo's Ariake Arena. The defeat forced the Japanese striker to look inward rather than make excuses.In a thoughtful Instagram post shared shortly after the bout, Anpo revealed the painful but necessary realizations that emerged from his three-round war with the Armenian legend."After soberly considering the cause of yesterday's defeat, 'Immaturity as a human' is the main cause over skill and physical strength. I noticed it clearly," Rukiya Anpo wrote.The post continued to read:"Before you step in the ring, I need to work on my 'inside human being.' No real strength comes out on that stage. More than resentment. Accept your weakness, that i found a challenge to move on I'm honestly happy right now. Here's to more growth. Still life ahead."Check out the post below: View this post on Instagram Instagram PostRukiya Anpo's post-fight message captures his fire to make it big in ONE ChampionshipThis admission from Rukiya Anpo cuts deeper than typical post-fight analysis.For a fighter who boldly dismissed Grigorian as predictable and one-dimensional during the pre-fight buildup – trash talk that motivated the veteran to deliver a punishing three-round display of aggression – Anpo's reflection represents a significant shift in perspective.Though the 30-year-old may have suffered a loss to Grigorian in his ONE debut, his promotional bow will provide him plenty of lessons to learn, improve, and restrategize for his next outing on martial arts' grandest stage.There is no shortage of opponents for the talented Japanese striker in the featherweight kickboxing division, after all. Moreover, with Masaaki Noiri suffering a loss to Superbon in their world title unification war in the main event of the card, an all-Japanese rematch between the two inside the Circle is looking more likely.Who would you like to see Rukiya Anpo return against next in the world's largest martial arts organization? Let us know below!Fans who missed any of the action from ONE 173: Superbon vs. Noiri can head to live.onefc.com to purchase the pay-per-view replay ticket. ONE Championship's blockbuster return to Tokyo featured five world title fights across MMA, Muay Thai, and kickboxing inside the Ariake Arena.