Mouse (2003, 12 episodes) 576p DVD-Rip with Extras by EruPii-Raws.

Video: 768×576, H.264 10-bit, CRF 17 Animation preset (Animated extras: CRF 15.5 Animation preset, Non-animated extras: CRF 17 Grain preset)
Audio: AC3 2.0 ch, 448 kbps
Source: R2 DVDs from U2

DDL: https://erupiiraws.wordpress.com/mouse-anime/

Welp, here’s another DEEN anime called Mouse, from 2003. IMHO, the OP is not half bad, although the singer’s voice can be a little irritating. Enjoy!