Kuro's grandfather was called "Black Lightning" by his friends because, long ago, he beat a dragon in a race. One of those friends, an old dog called Grampy, predicts that the dragon will soon return. Hearing this, Kuro decides to take up the challenge!

Takeshi's backpack is filled with snacks. Tama, accompanied by Tora and Pochi, goes chasing after him and his classmates on their class outing. They cross railroad tracks and rivers, facing many dangers... Will Tama and the others ever find the snacks they seek?
The grandson of Black Lightning 
alone would have been enough, but
حفيد البرق الأسود وحده سيكون كافيا لكن
Uns hätte der Enkel des
Schwarzen Blitzes schon gereicht.
Bastaba con su nieto,
pero también vinieron sus amigos.
J’ai juste fait appel au petit-fils,
mais il est venu avec ses amis.
Il nipote di Fulmine Nero sarebbe bastato,
Chamei apenas o neto
do Relâmpago Negro.
Одного внука Чёрной
молнии уже достаточно,