The Outbreak of War
The Outbreak of War is the 151st chapter of Shokugeki no Soma. This chapter begins the Survivor's Purge.
Sōma reveals that Jōichirō Yukihira is his father just as Erina walks in and is in disbelief as is her father. Erina ponders if this is true since Sōma and Jōichirō have different last names but Yuki shows a picture of them together from Jōichirō's recent visit, surprising her that it was true. Erina thinks back on her past treatment to Sōma and is horrified that she was mistreating the son of her idol nearly fainting as a result.
Azami seems to put something together after thinking about Jōichirō being Soma's father and gives Soma a cryptic message.