Oh. You just need to reach Ace tier that you have already obtained. You need to reach the Ace tier in 8 of the last 10 seasons, @утя. This is one the requirements to submit the application to become an investigator.
You need to reach Ace tier or above in 8 of the last 10 seasons. One season lasts for about 2 months. Start time and end time of a season can be found on the top-right corner of the event page, @утя.
モ
У
Х
Q
