One Soul, Two Bodies: Is It Ultraman? It's the Myriad Worlds!

(The protagonist has one soul in two bodies! One soul, two bodies! Multiple heroines... Not a transmigrator or someone reborn, and no System.) (Male form: Tiga; female form: Cosmos) An unforeseen catastrophe strikes Blue Star. Monsters appear everywhere, and as time passes after the upheaval, they appear more and more frequently and grow ever stronger. Humanity gradually loses all ability to fight back. Then a tower descends as humanity’s savior, granting people the ability to become giants of light. Twenty years after the upheaval, a special Warrior of Light appears. What story will unfold? Stay tuned! Tiga → Dark Tiga → Truth Tiga → Glittering Eternity Tiga (the forms appear in this order; in my novel, Glittering Eternity’s power is roughly equal to Infinity.) Main world → What Are You Doing at the End of the World? Are You Busy? Will You Save Us? →… (This is my first time writing a novel, and I’m a science student, so my writing might not be very good. Please bear with me! (/ω＼) *blushes*)