In the past, humans and monsters existed. Humans formed civilization, and monsters lived together among their own species.

One day, humans and monsters collide with each other and humans are defeated in the fight between humans and monsters.

Humans who have become a defeated species are called "underworlds" created by the magic of monsters, and humans are forever sealed by monsters.

Thousands of years later, the earth became peaceful. Monsters have passed so much time that they no longer know about human beings.

The main character's name is "Chris", and he is an orphan who doesn't know who his parents are or even who he is. Chris is a 16-year-old man wearing a light green striped shirt.

Chris can talk, but he's usually shy. Chris also lives in silence in his daily life.

When Chris is full of a growing desire for a monster of isomerism, the smooth "거1물1자1지" he usually has in his pants zipper grows.

When you rub the "거1물1자1지", "white liquid" is sprayed from the "거1물1자1지". The "거1물1자1지" can also be put into the body of a isomerism monster. However, Chris always hides this fact.

In the beginning, "Toriel", a goat monster living in a detached house in a small monster village, wakes Chris up.

Toriel, who is not Chris' biological mother, but his foster mother and elementary school teacher at his school, urges him to get in the car if he is late because he overslept today.

Thus, Chris rides Toriel's car to school, and other monsters greet the Chris family outside the car door.

Arriving at school, Toriel hugs Chris, then Toriel and Chris enter their respective classrooms.

Chris is a student who takes a lesson from a teacher named "Alphys," a lizard monster. Alphys is a lizard monster who teaches eight monster students besides Chris.

Chris enters Alphys' classroom, and already all the other monster children are seated, and he goes to his desk with only two desks left.

The class has begun, and Alphys explains the group assignment and says that a group of two should be made.

Each pair made in groups of 2. However, the other one cannot form a group because there are nine students.

Chris first approached a dog monster named "Temmie" and told him to pair up with him. Then, Temmie pairs with boiled eggs in her pocket and tells Chris that he already has a mate and shouldn't.

Next, Chris approaches Noelle, the deer monster, and says he wants to form a team.

Noelle is the second best studying female monster among the students. Chris is usually shy when he sees Noelle.

As Noelle matures, Chris sees her as an object of conquest. At that moment, Chris looks at Noelle's chest and "거1물1자1지" grows

Seeing this, Noelle presses her embarrassment and hastens to tell teacher Alphys that she wants to form a team of three.

As the bird monster "birdley," already paired with Noelle, refused to be able to form a group of three, Chris was unable to find Joe and tried to sit down, while the purple dinosaur monster "Susie" kicks in.

Susie takes the form of a so-called "bully" and "playing child" and Alphys, unable to help Susie's rebellious period due to her personality, notices that she has no chalk as soon as she tries to start the class in a restless manner.

Alphys can't teach without chalk, so she look for the guys who took it, but no one tells. but Noelle say will be in the supply depot, and Alphys asks Susie, who just happens to be standing at the door, to bring the chalk, and when Susie says yes, she asks Chris to see if Susie brings it well.

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