Growing up in his family's eyeglasses shop, Hiroki was familiar with "the joy of customers who found their ideal pair of glasses" from an early age. At the age of 21, he moved to Germany, a country with advanced eyewear technology, with the desire to "give customers dreams through eyeglasses." During his training period in Germany, he devoted himself to his studies, giving up his days off and overcame the language disadvantage, which led him to be requested by many customers. In 2013, he became the 4th Japanese person to become a “State-certified Master Optician”, and in 2014 he moved to Tokyo and opened Doitsu Meister Gankyouin. He continues to refine his customer service skills cultivated in an international environment and meet the diverse needs of customers from more than 10 countries. In addition to interviewing customers about their eye-related concerns and lifestyles, he also takes into account appearance factors such as customers' bone structure, voice, skin tone, and design preferences, to provide all customers with "the world's highest level glasses that have both medical function and fashion."