Thunder 3 Vol 7 by Yuki Ikeda. A Sci-Fi manga rated Teen, published in English by Kodansha in 2025.
Three ordinary middle schoolers stumble onto a parallel world after playing a mysterious disc borrowed from their teacher. When a lifelike dragonfly flies out of the TV, Pyontaro's little sister Futaba chases it and is pulled into that world, where alien invaders take her captive. To bring her home, the trio must team up with the parallel world's humans and face down an extraterrestrial threat.
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