Watta Takeo, un ragazzino che frequenta ancora le scuole, si trova a capo di una compagnia di trasporti spaziali a causa della morte del padre. Nello spazio una base mercantile viene attaccato da un robot appartenente a pirati spaziali e il Ministro della difesa terrestre incarica la Takeo General, la società di Watta, affinchè intervenga col suo robot spaziale Trider G7...

Watta viene interrotto nel bel mezzo di una partita di baseball scolastica dal suo segretario Kakikoji, per accogliere la visita del segretario della difesa alla Takeo General Company, venuto per ringraziarlo dell'aiuto precedente. Purtroppo un nuovo attacco viene portato alle basi di Marte e Watta deve partire all'istante. Il combattimento è duro, ma Watta, ricordando gli insegnamenti del padre, riesce a vincere. Tornati sulla Terra gli impiegati della Takeo General organizzano una partitella di baseball per risollevare il morale del capo.

Kaoru, la ragazza più carina della classe, organizza una festa per il suo compleanno e anche Watta viene invitato. Sfortunatamente la base sulla Luna viene attaccata e il Trider deve intervenire. Nonostante la sua reticenza, Watta deve prendere i comandi del robot. La lotta sulla Luna è dura, ma il bene ha la meglio. Tornato sulla terra, Watta si reca da Kaoru a tarda sera e scopre che l'amica ha conservato dei dolcetti per il suo ritorno; Watta, già contento per il gesto (è segretamente innamorato di Kaoru..), vuole fare anche lui una cortesia e porta i dolcetti a Kakikoji, che può far felici i suoi ben 12 figli!

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