Marvelous today released the Ikki Tousen DLC pack set for the Senran Kagura PEACH BEACH SPLASH. You can buy new playable characters from the TV anime, the costumes, weapons depends on what you need. The full set which includes everything, costs 2500 Yen (with tax), the costume and item set costs 1000 Yen (with tax). If you only need the items you can get them from 250 Yen (with tax) price one by one.
The special set includes four new playable characters from the show: Shimei Ryomou, Unchou Kan-u, Hakufu Sonsaku and Housen Ryofu with their weapons. Check out the pictures again in the gallery and get what you want.