Here ya go. This is a pack of 300. You need at least 408 sleeves to fit the entire game.

KMC 100 pochettes Card Barrier Perfect Size Soft Sleeves, 3 Packs/Total 300 pochettes [Komainu-Dou Original Package] https://www.amazon.com/dp/B00NU5F7U0/ref=cm_sw_r_cp_api_i_dqbeCb1B4XZNX