First half was very good. Easy to watch and funny. But second half was bad. It was painfull to watch festival of mutual crying with only a few good moments. And the last 4 episodes was totally useless.

Meeting her in the train and spying her was a total nonsense absurd and naiveness.

And why she tried to reject him? She could just pretend she is only a model for AG-3. Why her bevavior is similar to AG-3? Because robot was programmed to be like her. That's all.

Perfect argument. She can just pretend that she meets him first time and they would be together without problems. Even if he some day would know a truth he propably wouldn't react so dramatically, maybe even would be happy that she was AG-3.

Instead this we got totally unreasonable behavior of main character and very bad plot.

Or maybe instead "accidental meeting in the train" he should meet with Jo in business purposes and suddenly realize that she is very similar to AG-3 and try to date with her, gradually getting aware that she was a model for AG-3.

There were many possibilites to develop the story. Instead we got a very naive and absurd plot with only a few good eposodes after he realized she was a robot.