A long time ago, the country was plagued by savage dragons. A long time ago, the great-grandfather of the Roias family exterminated it, but it survived in the underground world. Loias' father goes underground in search of a magical tool. Thanks to his father, Roias, who has the holy sword "Dragon Slayer" in his hand, bravely confronts the dragon "Dragon Slayer IV". A total of 5 works including "Uddy Poko", "Twinbee", "Gradius" and "Magmax". Comes with a bonus page featuring Kobayashi Sho-sensei's original illustrations ("Dragon Slayer IV" Roias and Uddipoko: original illustrations).