Summary: Follows the life of a hero who manages to win all battles with only one punch. This ability seems to frustrate him as he no longer feels the thrill and adrenaline of fighting a tough battle, which leads to him questioning his past desire to be strong.

Maan I should've known I was going to have to start over from the beginning. I feel between the manga, webcomic and anime I should remember more than I do...
Chapter 1-2: Saitama's origin story. He got turned down for a job and decided nothing matters anymore, but he runs into a monster after a boy and ends up helping without thinking. He remembers his childhood dream of becoming a hero.
After winning the fight, he trains so hard he loses his hair but gains invincible power. He soon realizes that his heart now feels empty.
Chapter 3: Took down siblings, one made the other a giant killing machine.
Chapter 4: Had a dream there were monsters strong enough to challenge him. Honestly if Saitama wants to keep capturing that rush he should learn lucid dreaming.
Chapter 5: Worrying about how he's becoming emotionally numb. "I feel no fear, no joy, no excitement nor anger."
On the back of that there's a hilarious moment where Saitama can't squash a mosquito because it keeps escaping. 😂 Saitama lives in Z City where a demon level mosquito lady attacks.
Genos's first appearance!
Chapter 6: I love how Saitama reacted to Genos telling him about the mosquitos. "That's bad, isn't it? Let's run for i-..." Even for an invincible man mosquitos are still a Nope.
I've said it before and I'll say it again, Genos's body is way too fragile...
I love Saitama took out the mosquito lady with a slap like he was trying to do with the mosquito from earlier.
Chapter 7: Genos shares his entire life story in two paragraphs... 4 years ago a cyborg attacked his village. His brain had been damaged during the transplant. Genos was the only survivor out of his family but he had to be put in a cyborg body.
He says 'Dr. Stench' passed by his town on accident to stop the cyborg, but what if he's the one who made the cyborg and he felt guilty and that's why he helped Genos?
We may have found out more later I just don't remember;;
'House of Evolution', where the mosquito lady came from, wants to study Saitama.