KUDOYAMA, Wakayama Prefecture--Sobe Amako, a manga artist known for “Rakudai Ninja Rantaro” and its TV anime adaptation “Nintama Rantaro,” handed over her collection of hundreds of ...

Yuji Yamada, a ninja expert and professor at Mie University’s Faculty of Humanities, described the artifacts as “groundbreaking discoveries.” “Flat throwing stones could have developed ...