Consuming only Plenny shake daily and nothing else?

Would it be okay to only have Plenny shake instead of normal food? I've been liking Plennyshake so far and I've had it to replace my dinner everyday.

I have a plan to try only drinking Plenny shake and nothing else for two weeks to try if it can get me throughout the day. Though due to my work schedule I usually skip breakfast and only have lunch and dinner. Has anyone ever tried this? Should I be having more than 400 calories each meal then? Any suggestions or advices?