Guardian Titan: Hero Titan System

In a world enjoying a fragile era of unprecedented peace, an unforeseen threat emerges from the cosmos, shaking the very foundations of nations. Massive meteors, hurtling perilously close to Earth, send panic across the globe. In a desperate bid to avert catastrophe, nations unite to unleash their most destructive arsenal - the formidable sky missiles.

The collective efforts succeed, averting the immediate danger and eliciting worldwide relief. However, the jubilation is short-lived. The missile strikes trigger an unforeseen consequence that unleashes an unknown and cataclysmic force - the Kaiju.

About MC : normal person with heroic thoughts, no harem.