Thunder 3

Pyontaro is an ordinary middle schooler whose little sister Futaba follows him everywhere. At school, he and his closest friends Tsubame and Hiroshi are known as the “Small 3,” a trio with little status and even less confidence. One day their teacher, Doc, lends them a strange disc. When the boys play it, the screen reveals another world with an unsettling level of realism. While they are distracted, Futaba is pulled through the image and disappears. Refusing to leave her behind, Pyontaro, Tsubame, and Hiroshi follow her into the multiverse. The place they enter looks far more dangerous than anything on the disc, yet its rules do not treat the three small boys as ordinary. Their search for Futaba becomes a journey through a parallel reality where they may be the only ones capable of reaching her.