A classic kaijū manga by the author of BTOOOM!

Follow JSDF officers Yamato Yoshikazu and Sakimori Konoe as they face off against monsters of unknown origin that infest the troubled, disputed waters of the East Asian sea and have humans as a preferential prey!

Life was peaceful and quiet in the small port village of Miyakono, located in Japan's Kyoto prefecture. Quiet, that is, until the townsfolk were shocked by a rash of bizarre murders. Rumors abounded about the nature of the killer, but one thing was clear: the bodies were mangled by what appeared to be a set of very large teeth.
When a trio of students investigate the temple where the most recent victims were slain, a young man named Yousuke stumbles into and breaks a small shrine, from which emerges a phoenix-like creature made of light that flies towards him and disappears. When he realizes that none of his friends saw the light, Yousuke tries to put it out of his mind... until he is later attacked by the demonic beast that is responsible for the recent deaths. It is then that the phoenix spirit re-appears, offering Yousuke the power to defeat the inhuman beast that is stalking him.
A power, however, that will come at a great cost.

From Yen Press:
Ryouta Sakamoto is one of the top-ranked players of BTOOOM!, an online battle game. But no amount of simulated warfare could have prepared him for what is to come… Ryouta wakes one evening to find himself dangling from a tree by a parachute with no recollection of how he got there. Before he can orient himself to his unfamiliar surroundings, Ryouta is attacked. As a barrage of explosives rain down on him, Ryouta realizes that he too has a pack of bombs…bombs that look very similar to the ones used in BTOOOM! Ryouta may have mastered the online game, but can he come out on top in this real-life game of survival?

From Batoto:

Haruno Kasumi, a 14 years old girl, is quiet and shy girl who gets bullied at school and has a crush on a classmate. Her mother has no interest in what happens at home and her dad disappeared years ago.

Her life changes drastically as she gets a gift from her long lost father...