He stayed on for graduate studies at Kyoto University, from where he received his doctorate in 2002.

Since 2003 he has been teaching at Tokyo University of Foreign Studies, with the position of associate professor since 2007.

In 2006 he co-edited a Tangut-Russian-English-Chinese dictionary with Evgenij Ivanovich Kychanov, for which he provided the reconstructed Tangut readings.

[1] In 2016 Arakawa received the prestigious Kyōsuke Kindaichi Memorial Award (金田一京助博士記念賞) for his study of the Tangut version of the Diamond Sutra.

[2] Заслуги Н. А. Невского в исследовании тангутскогоязыка, Николай Невский: жизнь и наследие, 157--169, 2013年