As your question “why the sales quantity of DVD vol.1-6 and BRD vol.1-3 are all zero. Is this correct?”
Yes, that sales in the report is correct because the sale of DVDs and Bluray discs are not very good in Thai market and this can be sold with Toloveru’s fans only.
In addition, it is an old story and not a new release at this moment, so there is a decreased in popularity on the market.
Thus, there is dropped the sales and returned a lot of discs from the distributors.