Marisa learns the shocking truth she can't take it easy on her own as her life goes down hill. She begs for forgiveness and anon forgives her. Anon was not angry because it wanted a partner, but rather because it dared to think it would be able to live on its own.
Skimming the other images and your translations, looks like he just left her tank in the same place and would walk by. Probably would've been better to stick her in a less-visited room; seems like she freaked out a little because she thought he was visiting and was being ignored. If she had less frequent appearancess by him, probably would have adapted better. I'm no yukkuriologist though, just speculating out my ass.
Still, it's nice to see a story with an overconfident yukkuri that has a happy ending (as in nobody gets hurt).