Board Thread:Bug Reports/@comment-35569686-20180524103738/@comment-8846246-20180524105302

Sounds like you should do some reading around the wiki. The game has no finished rivals right now and is only a sandbox build.

Kokona Haruka is a test rival, in the final game she'll just be a regular student.

Oka Ruto is like the opposite of Kokona right now. She's a real rival, but right now she's just a normal student.

The first rival that will be in the game will be Osana Najimi, and she's yet to be implemented. She'll be implemented when the game officially transitions into a demo.

Pages I recommend you read:
 * http://yandere-simulator.wikia.com/wiki/Rivals
 * http://yandere-simulator.wikia.com/wiki/Students
 * http://yandere-simulator.wikia.com/wiki/Kokona_Haruka
 * http://yandere-simulator.wikia.com/wiki/Oka_Ruto
 * http://yandere-simulator.wikia.com/wiki/Osana_Najimi