Home›Authors›こやまようこ こやまようこ 3 works and 3 volumes in this database. notable works include “きのうを忘れよう”, “オス!新まい先生”, “ミッチは17才”. This timeline covers collected publication years, not career start or retirement dates. Sources and corrections 3 Works · 3 vols Publication timeline YearWorksRoleVolumes ?きのうを忘れようAuthor1?オス!新まい先生Author1?ミッチは17才Author1