"We weren't talking or sleeping."
Koroheke, 13, said it was an emotional experience.
"I was going through some stuff that day because there was something going down with my family.
"He's telling you what you need to know, what you need to hear and that you can get through things."
Three's television show The Hui had a crew in attendance, filming the event for their last show of the year.
King recommended they film at City College as he previously had a good experience there about five years ago.
"Mike has been through things that we can all relate to," Pomana said.
"What I took from his visit is that it's not silly or stupid to ask for help."
Meanwhile, Te Amo-Marsh said she related to a lot of what King said.
The 14-year-old said when she lived in Hamilton she was not in a good spot but is now thriving in Whanganui.
"He said that you may not be happy now, but later on in life, it's going to get better for you," Te Amo Marsh said.
"Everyone has an inner critic in them, they have someone who's talking to them in their mind, which is thinking and no-one is different to anyone else."
King quit comedy and began advocating for mental health about 10 years ago. He now travels New Zealand delivering presentations, mostly for youth.
Recently he completed the I Am Hope Aotearoa Tour which involved nine scooters, 70 talks and 3500km on the road in which he met 20,000 people.
King was able to raise $76,000 for his Key to Life Charitable Trust which aims to reverse the population trends of depression and suicide by effecting positive social change.
He also visited Te Kura o Kokohuia, Whanganui Intermediate School, Whanganui Girls' College, Rutherford Junior High School and Wanganui Collegiate School.
City College deputy principal Val Rooderkerk said King's appearance had a massive impact on the students and the challenge would now be maintaining his messages.
The students delivered a haka at the end of his presentation, which King shared on his Facebook page, saying it was one of the best he has seen for some time.
