Digimon World DS/Welcome to the Digital World

Prologue
One day, you decided to look up Digital Monsters in your school's computer, only to end up getting transported to the Digital World.

Upon arriving, you are initially confused, but you overheard some Digimon discussing about Digivolution and Tamers. Wanting to know more, you decided to follow them.

You reached a new place called Digi-Central and learned about Tamers from Terriermon. Wanting to become a Tamer yourself, you decided to go to the Union Office to register as one. On the way there, you bumped into a fellow Tamer, Kazuya, who introduces you to the concept of a Digi-Farm, and informs you that you need to register as a Tamer to get one. After learning this, you headed for the Union Office.

There, you meet Haruhiko Kogure (Mr. Gure) who revealed that he is the one who brought you here upon learning that you have potential to be a Tamer. After agreeing to help him, he introduces you to ClavisAngemon, who is revealed to be the leader of the Tamer Union. ClavisAngemon informs you about the goal of the Tamer Union, Tamer Ranks, and lastly calls Agumon to begin your Tamer Registration.

Becoming a Normal Tamer
Back in the Union Office, Agumon informs you of the Digivice and its functions, then proceeds to mention the Scan System and the Digi-Farm. Agumon then proceeds to tell you that you need to get used to being a Tamer first before you can get a Digi-Farm, and lets you choose a Partner Digimon to do so.

You can choose between 3 different Partner Digimon: Some of its strongest Digivolutions are Rosemon, Sakuyamon, and Kuzuhamon. Some of its strongest Digivolutions are WarGreymon, BlackWarGreymon, and Justimon. Some of its strongest Digivolutions are MetalGarurumon and Darkdramon.
 * Tanemon - an MP-based Insect species Digimon.
 * Koromon - a Balanced type Dragon species Digimon.
 * Tsunomon - an Attack type Beast species Digimon.

After choosing your partner Digimon, Agumon informs you about the Observers, and tells you to head to the Reader Room to meet the first observer.