Well, she did say to give her something 3 times better in return, and our Kazama-guy over there does seem like a simple guy who'd sometimes take things quite literally...
In the the final panels of the last page you can just b a r e l y make out Igarashi's head peeking up from the bottom cause she's so tiny, while Kazama-kun is doing a subtle clinched fist/guts pose from behind the TBC sign (as a result of hearing how good his handmade sweets turned out).