After centuries of war, humans emerged victorious over monsters thanks to some wizards. They tried to conquer the entire world and kill all monsters, but for unknown reasons a massive rift opened up while they were killing the monsters, causing all of them to escape into the rift. The reason or how the rift opened up remains a mystery, even after extensive research, that couldn't provide an answer. For a long time, humans thought they were safe, and indeed they were for a long time, but eventually they discovered rifts appearing randomly around the world. These rifts could occur anywhere and at any time, and along with the rifts, an indefinite number of monsters would emerge from them, fighting to retake the world. The number of monsters that came out of each rift was completely independent, sometimes leading to a large invasion, and sometimes just an attack by three monsters. Special students who have special spirits trained specifically to stop these monsters always prepared themselves on the streets or at home, so that when the monsters came to invade, these students could blast the monsters with all their power. Every person has a special spirit, but not all of these spirits are useful spirits. There are many types of spirits in the world, generally speaking, there are half-dull spirits combined with a variety of half-emotions such as Intelligence, Power, Healing, Fear, Courage, etc. The most common one is the Kindness Spirit, which generally has no power but is skilled in healing. The Justice Spirit is a spirit that completely represents power, with power at the highest level possible but with very little abilities such as healing. Although they can heal small wounds, it is impossible for them to heal large wounds. There are many spirits like this, of course, and there are also spirits that can be the complete opposite, the biggest example of which is the Hatred Spirit. The Hatred Spirit has average levels of all characteristics, but the biggest characteristic of the Hatred Spirit is that, unlike Pure Hatred spirits, it has the power to occur within people and completely control the person. Remember, everyone has a little bit of Hatred inside. the Determination Spirit, which exists only in two people in the world by chance, is one of the strongest spirits in the world. The Determination Spirit has all the features, like the Hatred Spirit, but unlike the average, its holders have a very high level. However, these spirits can change according to the personal characteristics of humans, for example, there are incredible different spirits, such as a rough healer or a cowardly Justice Spirit. If you ask who the two people with the Determination Spirit are, they are the Fujimoto twins, Kenta and Takumi Fujimoto. The hospital where the Fujimoto twins were born was attacked by monsters, and because of the strange technology of the monsters, the hospital was coated with a strange substance that was not deadly. This substance was formed as a result of the mutation of the twins' spirits during birth. Now, the Fujimoto twins are studying at the best Mystical Training School in Japan. The twins, along with their best friends, Hikari Sato and Kenshin Kurosaki, plan to protect the world and become the strongest people in the world for many years to come.