The Guts stat inPersona 5 Royalis one of the five social stats Joker can buff during his free time. Guts allows Joker to face more threatening situations, and is also required to be a certain rank to unlock the Hanged Man confidant. Like the other stats inPersona 5 Royal, there is a diverse range of activities Joker can do to gain points in Guts.
There are a lot ofitems Joker can use, movies he can see, and part-time jobs he can do that boost Guts. These activities typically boost Guts between +1 and +3 points. It may also be worth checking the calendar, as certain activities and stat boosts only relate to certain dates and times of the day.

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Item-Based Ways To Raise Guts
From books to games and DVDs, Joker can gain a lot of Guts just from consuming media. In particular, there are a ton of books that slowly become available at the school library that boost the Guts stat.
Guts Gained
TV
Buy from Yumenoshima in Yongen-Jaya. DVDs can then be rented on Shibuya’s Central Street.
Pirate Legend (Book)
Can be borrowed from the school library after Ryuji joins the party.
+3

The Gallant Rogue (Book)
Can be borrowed from the school library after Yusuke joins the party.
Cry of Cthulu (Book)

Can be borrowed from the school library after Futaba joins the party.
The Hero with a Bow (Book)

Can be borrowed from the school library afterAkechi joins the Phantom Thieves.
Ghost Encounters (Book)
Can be bought from the Taiheido Bookstore starting on 7/1 in Shibuya’s Central Street.
+4
Time-Sensitive Ways To Raise Guts
There are a lot of movies that give Joker a Guts boosts, but they are time-sensitive and change each month. There is also the consideration of certain days of the week and the weather for certain activities.
What to do
Go to the bathhouse in Yongen-Jaya and stay longer.
Buy and drink juice in the Shibuya Underground Walkway.
Raises a random stat by +1
After Unlocking Bank of Gluttony and Casino of Jealousy
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Tae Takemi And The Big Bang Burger Challenge
Tae Takemiis the one confidant that Joker can gain Guts by hanging out with. She is also a useful confidant, so Guts or not, players will want to rank her up to get access to more medicines. She is usually available in the daytime, and not nighttime unless it is raining.
Lastly, there is theBig Bang Burger Challenge. This challenge boosts all social stats except kindness. The Comet Burger will gain +1 Guts, the Gravity Burger will gain +2, and the Cosmic Tower Burger will get +3. There is a lot of reward, making this a must-do activity at some point during the game.