[Soliloquy]

Author & Artist - Ashihara Daisuke

Synopsis - A gate to another dimension has burst open, and from it emerge gigantic invincible creatures that threaten all of humanity. Earth's only defense is a mysterious group of warriors who have co-opted the alien technology in order to fight back!

Spoiler:

This is an interesting manga with a sci-fi setting but the most appealing thing about this manga is the main character. He is a mysterious transfer student from unknown countries who seems very laidback, straightforward and generally clueless about how to act courteous. Mikumo Osama has been assigned to guide this transfer student all the while some monsters come and attack the city during the day. The manga is pretty humorous and character design is pretty well done.