There are 28 total books needed to unlock all Skills in the Skill Menu in Lost Judgment. They are purchased from vendors, earned as rewards for Side Content, or found in the environment. Obtaining all the books then allows you to purchase all skills, which is required for the “Skill Master” trophy and achievement.
Skill Book Locations
Skill Books are listed in the order that they appear in the Valuables menu, underneath your currently obtained records. Note that for the handful of books that can be obtained during the story or at stores, they only appear at the store after the point you would have been able to acquire them during the story, so you can’t just go to the store and purchase them early.
Book of the Wounded – Obtained during the story in Chapter 2 OR purchased from Onodera’s Wares for 3,500 SP
Book of the Ardent – Squirrel Search – Squirrel #29 Lost Judgment Squirrel Search Locations
Squirrel located on the brick pillar fencing just outside Seiryo High School.
Book of the Ravenous – Side Case – Reward for completing Side Case #11: The Forbidden Taste Lost Judgment Side Cases Walkthrough
Book of the Brink – Obtained from max level Pawpularity with the Orange cat located by the Homeless Camp in Ijincho
Flux Fissure Redux – Squirrel Search – Squirrel #19 Lost Judgment Squirrel Search Locations
Squirrel located starting inside Welcome Pharmacy in Ijincho.
To Crush a Dragon – Obtained during the story in Chapter 12 OR purchased from Xi Ying Tang in Ijincho for 78,000 Yen
Skateboard Rocketeer – Purchased from Skateboard Point Exchange for 35,000 pts
Memoirs of an Eagle – Side Case – Reward for completing Side Case #34: My First Errand Lost Judgment Side Cases Walkthrough
Excerpts of a True Crane – Gauntlet: Air Yagami clear reward – One of the easiest gauntlet missions, you can only deal damage to the enemies when in the air, so just continually jump off walls or use Sky Dancer Air Walk to launch attacks. 5 minutes is an absurd amount of time to complete this in.
White Snake Analects – Squirrel Search – Squirrel #15 Lost Judgment Squirrel Search Locations
Squirrel located starting inside the Dinosaur’s mouth by Wette Kitchen in Ijincho.
Book of Slithering Snake Vol. 1 – Purchased from Ebisu Pawn Kamurocho for 30,000 Yen
Book of Slithering Snake Vol. 2 – Squirrel Search – Squirrel #28 Lost Judgment Squirrel Search Locations
Squirrel located starting at the top of the stairs leading down by the river, south of Ichiban Confections.
Book of Slithering Snake Vol. 3 – Purchased from Onodera’s Wares for 10,000 SP
Showa Duel Records: Man – Batting Center Prize Exchange for 2,000 pts
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Showa Duel Records: Earth – Side Case – Reward for completing Side Case #18: The Chaos of the Masked Writer Lost Judgment Side Cases Walkthrough
Showa Duel Records: Water – Squirrel Search – Squirrel #26 Lost Judgment Squirrel Search Locations
Squirrel located on the southern Fence by the Hello Work taxi stop.
Showa Duel Records: Fire – Obtained from max level Pawpularity with the striped cat located by the Homeless Camp in Ijincho
Showa Duel Records: Wind – Squirrel Search – Squirrel #34 Lost Judgment Squirrel Search Locations
Squirrel located inside the Men’s Entertainment Box building in Kamurocho.
Showa Duel Records: Sky – Purchased from Onodera’s Wares for 3,500 SP
Superstitious Eater’s Guide – Side Case – Reward for completing Side Case #31: Squirrels Just Wanna Have Fun Lost Judgment Side Cases Walkthrough
Surprise Backhug – Purchased from Coming Boon for 3,500 Yen
Ramblings of a Hermit – Purchased from Open Road Shogi (Outdoor Shogi) prize menu for 250 shogi points
The Walkin’, Talkin’ Hermit – Squirrel Search – Squirrel #35 Lost Judgment Squirrel Search Locations
Squirrel located inside the window of the building opposite Smile Burger in Kamuorcho.
The Loyal Dog of Bushu– Found by searching with Ranpo the Detective Dogs at the south end of Isobe Lane in Ijincho.
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Unofficial VR Strategy Guide 2021 – Purchased from Onodera’s Wares for 100 SP
Unofficial VR Strategy Guide 2021 [Append] – Found by searching with Ranpo the Detective Dog by the Hills Garden label on the map in Kamurocho
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Unofficial VR Strategy Guide 2021 [True] – Squirrel Search – Squirrel #47 Lost Judgment Squirrel Search Locations
Squirrel located on the white sign in the dead-end east of Sushi Zanmai in Kamurocho.
The Art of Gluttony – Purchased from Onodera’s Wares for 50,000 SP
For more guides on everything needed to 100% completion, check out the Lost Judgment Wiki & Strategy Guide.
Book of the Brink seems to be bugged for me. I have maxed out the orange cat but I’m just getting random items.
A bit late, but I had the book drop from the same group of cats but instead of the orange one it was the all grey/black that dropped it for me.