Riki Osumi books & textbook
Dizuni no saikyo manyuaru : Donna hito mo mizukara ugoku jinzai ni kaete shimau.
Kankishuppan. /2014-08-01 Tankobon Softcover
isbn-10: 4761270209 / isbn-13: 9784761270209
Watashi wa ima totemo shiawase desu : Nanbyo no tomodachi kara anata e.
Popurasha. /2010-12-01 JP Oversized
isbn-10: 4591121925 / isbn-13: 9784591121924
