I don’t think you can go the Support Tasa route and succeed, what I did was Support Melita and beat Tasa, then killed Tasa’s 3 agents.
Edit: Oh wait, Nvm, the first house is outside of the city, go through the gate, and go into the house with yellow flowers right next to the gate, and for the second one go into the weapon shop, and the third house is below the running children, with yellow flowers(Melita Supporters’ symbol)
Edit: Oh but going the Support Melita route gives you an extra slave in the servants quarter with an extra sex scene, so that’s the benefits.