1956 Born in Tokyo
1979 Graduated from the Department of Japanese Painting, Faculty of Fine Arts, Tokyo University of the Arts
1981 Graduated from the Graduate School of Tokyo University of the Arts, majoring in Japanese painting
1996 Graduated from the G. Ballardini National Ceramic School
1994 Solo Exhibition, Awajicho Gallery (Tokyo)
1997 Solo Exhibition at Loggetta del 39 (Faenza, Italy)
"Possibilities of the Vase" Exhibition at Palazzo Cheesi (Milan, Italy)
1998 50th Faenza International Ceramic Biennale, Faenza International Ceramic Museum (Faenza, Italy)
4th Cairo International Ceramics Biennale Exhibition (Cairo, Egypt)
38th Castellamonte Ceramic Art Exhibition, Palazzo Comunale (Turin, Italy)
1999 Solo Exhibition, Studio Cavalieri (Bologna, Italy)
"Terracotta from Italy: Aldo Rontini and Mokichi Otsuka" Exhibition, Sogetsu Museum of Art (Tokyo)
2000 Solo Exhibition at the Tokyo Art Fair, Tokyo Art Club (Tokyo)
2002 Solo exhibition "Otsuka Mokichi's Terracotta" at the Art Salon of the Mitsukoshi Main Store in Nihonbashi (Tokyo)
2003 Solo exhibition "Otsuka Mokichi's Terracotta" Onuma Yamagata Main Store (Yamagata)
Solo exhibition at the Tokyo Art Fair, Tokyo Art Club (Tokyo)
2004: Exhibited at the 4th 21st Century Exhibition at the Tokyo Art Club (Tokyo, Nagoya, Kyoto, Osaka, Kanazawa), and every year thereafter until the 15th (2015)
Collection Exhibition "Animal Motifs" The National Museum of Modern Art, Tokyo (Tokyo)
2005 Solo exhibition "Otsuka Mokichi's Terracotta" at Nihonbashi Mitsukoshi Main Store Special Selection Gallery (Tokyo)
2006 "Inner Smile" Exhibition, Loggetta del 39 (Faenza, Italy)
"Human Form" Exhibition Shiga Prefectural Ceramic Cultural Park (Shiga), Hyogo Ceramic Art Museum (Hyogo), Shizuoka Art Gallery (Shizuoka)
2007 Solo Exhibition at Salon Fontanone (Faenza, Italy)
2008 Solo exhibition "Inner Smile" Tito Balestra Museum of Modern and Contemporary Art (Longiano, Italy)
2009 Solo Exhibition "Inner Smile" Niart Gallery (Ravenna, Italy)
2010 Solo Exhibition "Inner Smile" at Nihonbashi Mitsukoshi Main Store Special Gallery (Tokyo)
2011 Solo Exhibition "Inner Smile" Faenza International Ceramic Art Museum (Faenza, Italy)
2012 Solo Exhibition "Goddess and Cat" at Gallery Ayurazato (Yamanashi)
Solo exhibition "Inner Smile" Palazzo Esposizioni (Faenza, Italy)
2013 Solo Exhibition, Gallery Yoshii (Paris, France)
"The Shape of Earth" Exhibition, Mashiko Ceramic Art Museum (Tochigi)
2014 Solo Exhibition "Inner Smile" Nihonbashi Mitsukoshi Main Store Special Selection Gallery (Tokyo)
2015 Solo exhibition "Otsuka Mokichi Encounter 2015" Manyo Cave Miyuki Store (Tokyo)
2016 Solo Exhibition "Silent Vibration" Niart Gallery (Ravenna, Italy)
"Creation and Creation 2016" Tokyo Art Club (Tokyo, Nagoya, Kyoto, Osaka, Kanazawa)
2018 Solo exhibition “Between Forms the Terracotta Cosmos” (Ippodo Gallery New York)