"I'm this tough dude that doesn't tap, but I'm also human, too," Inoue said. "I had insecurities in prison. I had hard times. I had to overcome it a lot."
Inoue's stay stemmed from an October arrest by the Tokyo Metropolitan Police for marijuana possession. The 41-year-old said the sudden nature of the incident was jarring.
"The hardest thing about it is that it was out of the blue," Inoue said. "I was just sitting in a parking lot, and they just came. They wanted to do a routine search of the car, and all this [expletive] came out. I was like, 'Whoah.'
"I had all these appointments that I had to just miss. I went to jail, they took all of my phones. I couldn't contact anyone."
"The next day [the police] went down to my gym," Inoue said. "They went down to my house. They had search warrants. They searched everything. Nothing came out, of course. Just the stuff in the car."
"I lost 25 pounds in there doing push-ups, sit-ups, whatever," Inoue said. "I'd fold up my sweats and put them full of magazines and do curls. I was just working out in there. There's no junk food. So it was good."
"I had one Yakuza guy in my room," Inoue said. "I had a guy that sold fake notes, bank notes. And then I had a guy who had sexual harassment on a 22-year-old kid. So I had a whole range of people.
"I was laying in the room one night, and told the guys, 'You know what? Our room is the [expletive] worst room.' They said, 'What do you mean?' I said, 'You've got a guy that was holding drugs, a guy who was fondling a chick, a guy that sells fake bank notes, and you've got an underworld figure. This is the worst room.'"
"At 8:00 p.m. we could lay our futons out," Inoue said. "We woke up at 6:30 a.m. At 7:00 a.m. we had to put all of that stuff away. So we're sitting in the room with nothing. So I would put all of my roommates in the middle, and I would run circles around them. I would run 400 laps in the morning, 400 laps in the evening. Every 25 laps I would do 50 push-ups, then run the opposite way and do 50 push-us. I would do almost 800 push-ups a day."
"When you're comparing the inside to the outside, inside there's nothing to look forward to," Inoue said. "But once you close out the outside and admit in your heart that it's gone -- and that you're inside -- there's a lot of stuff to look forward to. Food all of a sudden started tasting good. When I compared it to the outside food, it didn't taste good. But once I'm inside, and I'm comparing it to the inside, there's nothing to compare with this. It actually got bearable.
"It made me appreciate a lot of things. When I was inside, I was looking outside and I was thinking. I appreciated the rain. We had a little exercise room, and when I went there the sun would beat down. A lot of times you walk out in the sun and you're like, 'Whoah.' And I'm looking at the sun trying to get it on my face. When it's raining I'm standing in the rain like, 'Wow, rain.'
"So I realized that there are so many simple things in life that I overlooked. It's a weird thing to say, but I think it was good for me. It changed my whole personality. It changed my whole view on things. And I'm much happier."
"[The book] will give a lot of insights on what fighters go through in their head," Inoue said. "Some people think Enson, 'Yamato Damashii' -- the unbreakable spirit, but it will show a lot of human in me.
"I kept a diary of the prison. I think a lot of things in my life are like a movie, and there's a lot of things that I overcame or went through that a lot of people might actually learn from just by reading the book."
"The only thing that's kind of bumming me is that I was preparing to get back in the ring," Inoue said. "The only thing with that is in Japan there is a grace period. If you do something wrong, no one is going to want you to get back in the ring right away because you're going to show that you don't even regret what you did. I don't think I could fight for a year there."
"I'm not aiming for no belt," Enoue said. "I'm not saying I am be the best fighter in the world. I know I'm not. But I know I can give a show as good as any other fighter right now. I'll throw down with anyone."