First day in another world

 I am Raien, an ordinary salaryman. One day, while working until morning, in a dizzy state, I passed a bridge. When I didn't pay attention, the bridge had no railing. And I unfortunately fell into the Raien River, trying to struggle but my whole body still sank deep.When Raien woke up, he found himself in a very strange world. In front of him was a queen sitting on a throne full of power. He didn't know where he was until the queen spoke. "What's your name?" Before Raien could answer, someone from the river suddenly shouted loudly "That queen is here. You dare to remove the wall just to find that withered flower, now the monsters are sweeping inside" After saying that, he was about to rush forward when he was stabbed to death by two nearby soldiers on the spot. This scared Raien and he backed away "What...what...what the hell?.." The queen didn't care about that guy but looked at Raien with an arrogant gaze "Hmm! If you don't want to be like him, then quickly go stop those monsters".While everyone else could use magical skills in the other world, Raien didn't know how to use anything and could only run away. But no one could hide forever when a monster appeared near Raien, it was a pile of black, slimy tentacles sticking out from the ground and rushing to attack, but luckily Lian rushed to help and support the attack. She knew her didn't have any power so she threw him a weapon, a sword with red outlines. "Hold it and attack!" She shouted and dodged the attacks. Raien was bewildered but then regained his composure and rushed to support Lian. The two of them coordinated very well to attack The Voice.Then, with the support of other healing mages, they also successfully destroyed many The Voices. But Raien was also seriously injured and with the long and quick transformation, Raien lost his strength and collapsed. At that moment, a The Voice was approaching him, thinking that he was about to die. When it tried to use its sharp claws hidden behind the tentacles to attack, another mage arrived in time to support it by using his lightning control ability to attack The Voice. Raien quickly seized the opportunity. Although his hand had begun to go numb, he still tried to hold the sword to rush forward and slash straight at The Voice's head.