Monster Battles: The Campus Belle Summoned Me, and I Became Zero from the Start

(Invincible + absurd comedy + pure fun + multiple heroines + monster girls) College student Ling Ren is busy selling a “Zero transformation device” on Xianyu. Then he falls straight into a brutal otherworld where humans and beasts slaughter one another! Meanwhile, when the aloof campus beauty Su Yu activates a summoning array, everyone holds their breath. The light fades, and out comes an actual human, Ling Ren! The crowd bursts out laughing. “Pfft! Su, is your summoned beast... a human?” Facing the jeers, Ling Ren scratches his head, pulls out a pair of glasses, and makes an absurd declaration. “Uh... leveling up? Don't ask. Let's just say I'm max level from the start. Probably!” [Ding! Ultraman Role-Playing System activated! Current form: Ultraman Zero (base form). As for strength? Just be absurd enough!] So when terrifying monsters come roaring in... “Whoa! Has this corn cob come to life? Perfect, let's test my firepower... I'll roast it for a late-night snack!” The Zero Twin Shoot fills the air with a delicious aroma! And when the global league is packed with top competitors... Su Yu covers her face. “Sorry... this ‘human-shaped summoned beast’ of mine has a bit of an... unusual thought process.” Ling Ren instantly kills every monster on the field. But the absurdity never ends! When a dark figure tears through space and descends, Ling Ren's CPU practically burns out. “Wait! Dark Zero?! No way... does this world have knockoffs too?” Even more absurdly, summoned beasts in this world can fuse with their masters and transform into monster girls?! I know Zetton girls. Hyper Zetton girls? What the heck? No, summoner, when did you turn into an Evolved Godzilla girl?