Miwa released her first album '' Guitarissimo '' on April 6 , 2011 ( was scheduled to release a week earlier on end of March but was delayed due to the Tōhoku earthquake and tsunami and its aftereffects ) . The charts performance was miwa 's best overall : the album reached No. 1 in the Oricon 's album charts , making Miwa the first Heisei period-born solo singer to reach a No. 1 on the album charts in the history of the Oricon
Tōhoku earthquake and tsunami
2011 Tōhoku earthquake and tsunami
Miwa (singer)