Volume 12

First Hand PSIence Fiction (体験ΨエンスフィクションTaiken Saiensufikushon) is the 12th volume of the Saiki Kusuo no Psi-nan, also known as The Disastrous Life of Saiki K., manga series.

Cover Conversation
Teruhashi Makoto: I have the cutest little sister in the world. Teruhashi Kokomi: Oh stop it, big brother. (You mean in the universe, right?)

Alternative Cover Conversation
Makoto: What about me, Kokomi? Kokomi: You are the best in the world, big brother. (Well, maybe just in the Kanto region.)

Character Comment
Makoto: Let me borrow this once you are done. I want to cut all the panels that have Kokomi in them.

Chapters
Note: Chapters with the label have NOT been adapted into the anime series.
 * Chapter 118: The DiPSIster of the Rental Video StorePsi icon.png
 * Chapter 119: The Ultimate PSInancial Strength of the Saiko Clan
 * Chapter 120: Halloween Party in SesPSIon
 * Chapter 121: The DiPSIster of Break Time
 * Chapter 122: CourtPSIde Love Game
 * Chapter 123: Out of Control Imagination ExerPSIse!
 * Chapter 124: First Hand PSIence Fiction (Part 1)
 * Chapter 125: First Hand PSIence Fiction (Part 2)
 * Chapter 126: First Hand PSIence Fiction (Part 3)
 * Chapter 127: Fashion PSInce: Out of Stock
 * Chapter 128: Osu! Love Challenge

Summary
One morning, when Kusuo woke up, he finds he has travelled 20 years into the past! He runs into Riki’s dead father and his parents before they met!? Kusuo then accidentally changes his own future, will he be able to fix it back?

Character Profiles

 * None

Author’s Comment
"It has been almost 3 years since the start of this searlization. During that span of time, my physical condition has not declined even once. I mean, from the start my body is not weak, but I feel like I would get sick at least once in a year. Since the start of this serialization, I have been perfectly healthy, aside from sleep deprivation. Despite my eating and living habits being messed up, going outside without a mask, and not really washing my hands. I would like to thank my parents for giving me this healthy body."

- Asou Shuuichi

Trivia

 * This volume cover is the first to not feature Saiki Kusuo.
 * The other times being Volume 22 and Volume 23.
 * This volume has the highest peak ranking on the weekly Oricon manga chart by reaching 5th place. The next volume to reach a ranking close to it was Volume 24, with it peaking 6th place nearly 3 years later.