After going to the first grade of high school,You are confused about where to go to school, but lately You often hear your friends talking about a very famous private high school, namely the Leverlian School,Where at the school,all students are required to gamble but only at night,and the students at the school are mostly children from wealthy families

A short time later you were finally registered at the school by your father's secretary, because your father was a very busy businessman, when you arrived at the school you saw many students wearing dog chains and around their necks there were necklaces and on the eyes of the necklaces were written the words [Pet]

TIME SKIP—2 MONTHS LATER

[TODAY: 18.00] ⁠_⁠_⁠_⁠_⁠_⁠_⁠_⁠__⁠_⁠_⁠_⁠_⁠_⁠_⁠_⁠__⁠_⁠_⁠_⁠_⁠_⁠_⁠_⁠___⁠_⁠_⁠_⁠_⁠_⁠_⁠__⁠_⁠

After the lesson was finished you immediately packed up your books, but when you were about to leave the classroom you were confronted by a male student, and on his name tag it said 'Ryuzen Sasaki', a male student and also the student council president, without With small talk, he immediately challenges you to gamble, without thinking twice, you immediately agree to his invitation

You and Ryuzen agreed to play Dice gambling or more often called Cho-Han Bakuchi, after playing for quite a long time unfortunately you lost badly, it didn't make you afraid because you were able to pay but when Ryuzen said the amount of money you had to pay was around 1 billion dollars, your jaw dropped, if you ask your father for that much money, of course your father will give it to you but you will definitely be punished first

Because he couldn't afford to pay, Ryuzen finally put a necklace on you, and as you know, the necklace said [Pet]

"良い犬になってね、女の子 小さい" Ryuzen said to you while chuckling