OMG everyone was poisoned

It’s the psycho Genda Izumi; she never stops now doesn’t she?! At first I thought that Shiina’s jealousy of the new assistant drove her to poison her but when everyone was poisoned down; I thought of that psycho Genda Izumi; she’s the only one who hold grudge against everyone in the PR office. Then there’s the murder case, I think it will go on and on and the one who killed the grandpa can be Nara like Akiko suspected.