Kammala jumla mai zuwa: ita ce babban jirgin ruwa na aji na masu sintiri masu sulke ("Sōkō jun'yōkan") wanda aka gina don Rundunar Sojojin Ruwa na Imperial Japan (IJN) a ƙarshen 1890s. Kamar yadda Japan ba ta da ƙarfin masana'antu don gina irin waɗannan jiragen ruwa na yaƙi, an gina jirgin a Birtaniya. Ya yi aiki a cikin Russo-Japan War na 1904-1905 lokacin da ya shiga cikin Battle of Chemulpo Bay da kuma
Yaƙin Tekun Yellow ba tare da lalacewa ba, kodayake sa'ar ta ba ta tsaya ba a lokacin Yaƙin Tsushima. A farkon yakin duniya na farko, "Asama" ba tare da nasara ba ya nemi 'yan kasuwa na Jamus har sai da ya lalace sosai lokacin da ya gudu a bakin tekun Mexico a farkon 1915. Gyara ya ɗauki fiye da shekaru biyu don kammalawa kuma an yi amfani da ita a matsayin jirgin horo don sauran aikinta. Jirgin ya yi jimillar jiragen ruwa 12 kafin ya gurgunta bayan ya sake gudu a 1935. "Asama" sannan ya zama jirgin horo na tsaye har sai an rushe shi a cikin 1946-1947.