This took me a really long time to do but here you have it, Sengoku Basara Season 1. I did some error corrections on the subs because I noticed some mistakes while watching it, mostly in episode 6.
This download includes Sengoku Basara Season 1 + OVA (episode 11.5) + Mini Sengoku Basara: Chousokabe-kun to Mouri Special Episodes 01-07 + Scans + Creditless OP/ED.
Most Sengoku Basara season 1 videos I found had crappy quality (DVD or LQ-H264). This is probably the best non raw you’ll get.
Title(s): Sengoku Basara: Samurai Kings, Devil Kings, Samurai Warriors
Video: 1920x1080p [philosophy-raws] -> 1280x720p MP4
Audio: Japanese 2.0 channel AAC
Subs: ep01-13 Error Corrected [Senbei], SP01-07 MODIFIED [(`w´)]