The SMS/chatbot is underwhelming. 弦くん (in my case) will ask me a question about something I like, like my favorite anime or book or movie, and if I don't answer RIGHT AWAY, the bot will move onto another topic. I can't naturally reply to 弦くん about my favorite thing anymore, the bot will just spew out some generic response. Instead, I have to go into my profile and enter that information in the now-unlocked line.
The chatbot mostly texts me to tell me he's eating and that he's tired, or that I shouldn't forget to eat lunch, and when I respond (in Japanese) about the same subject, the chat usually gives a general reply. It only seems to understand THE MOST BASIC things. Doctor Sbaitso on the Soundblaster did better.
The story for 弦くん is cute but also annoying. Nobody got time to be a full grown man's mom.