Daring Gigas appears in the Steamy Bathhouse as a standard enemy in halls 3 through 8 and as a sub-boss in hall 7. It must be fought in order to continue past the 7th Hall.
The standard Daring Gigas is unremarkable by itself. If accompanied by Monopolizing Cupids, they will attempt to cover its weakness to Wind with a Green Wall spell. Upon being defeated, Daring Gigas may drop Proof of Spirit. Selling 6 Proof of Spirits at Daidara will unlock the Knifeproof Coat male armor for sale.
The boss version of Daring Gigas sheds its weakness to Wind and has increased stats, however it generally only attacks every other round. This time can be taken to heal and guard before the next attack and if the party is sufficiently leveled the party member will generally survive a Power Charged attack while guarding. The player can use this to slowly whittle away its HP. Eventually the shadow will run out of SP and will frequently waste turns attempting to re-buff itself. As soon as it runs out of SP Yosuke can cast Dekaja to remove any buffs and the party can attack normally until it is defeated.