When an extraterrestrial organism known as "Savage" attacks mankind, the only technology capable of combating the enemy is a weapon known as “Hundred.” A survivor of a Savage attack, Hayato Kisaragi is a teenager boasting the highest compatibility level with the aforementioned technology and as a result, is invited to master his skills at Little Garden, a prestigious military academy aboard a battleship. Over the course of his intense training for the battle ahead, he immediately attracts the interest of multiple female peers and gets drawn into a number of incidents as he tries to fight against the creatures that now inhabit Earth and threaten its safety.

Trying to move on in his life, former professional golfer Kazuyoshi Igarashi arrives at Hinoshima Island for a job at its development center. Expecting the island to be a very rural area with nothing much to offer, Kazuyoshi cannot hide his amazement when he discovers a complete golf course made by the island's inhabitants. Using the seaside terrain to their advantage, the people there have adopted golfing as their hobby. To add to his surprise, Kazuyoshi meets a young girl named Tonbo Ooi, who has been playing golf using only a 3-iron—a notoriously difficult-to-use club. As the former pro gets more involved with Tonbo and witnesses her seemingly impossible shots, he begins to see golf in a whole new light, rediscovering how fun the sport can actually be.

On November 23, 1957, the whole world witnessed the Federal Republic of Zirnitra's monumental achievement of sending the first live animal—a dog—to outer space. Since then, the space race between the confederacy and its competitor, the United Kingdom of Arnack, has intensified; the two countries hope to one day send humans to the cosmos above. As a dog's biology is inherently different from a human's anatomy, there is no way to perfectly identify the risks involving space travel and its effects on an individual's body without actually sending someone for observation. However, Zirnitra's government has a potential solution: to experiment on vampires, whose biological similarity to humans is too significant to ignore. Despite being forcibly taken from her home in the mountains, vampire Irina Luminesk shows no resistance and is even willing to train as a test subject. Lev Leps, a former top candidate to become the first human cosmonaut, is designated to accompany Irina and act as her guide. Through their time together, Irina and Lev begin to develop a mutual love for outer space, bringing them closer together.