Because this is an unofficial mod distributed via fan forums and file-sharing sites, you must exercise caution. Many sites bundle malware with flash games.
If you want to play seriously against a friend, stick with the official Bleach Vs Naruto 3.3 . If you want to drop a nuke as Saitama (One Punch Man) on a helpless Sakura, download the Mod 540. Bleach Vs Naruto 3.3 Mod 540- Characters Download