Boruto episode 156 hands Chocho her clan's Butterfly Mode: coaxed by sweets and then driven by the urge to guard Anko and a stolen bean shipment, she finally taps the transformation her father tried to teach her.
Choji shows Chocho the Akimichi Butterfly Mode, but she has no appetite for the training until he bribes her with sweet bean soup. Her attempt fails to shatter a boulder the way her father can, and he presses that this secret family jutsu is hers to master. He also observes that between holding back her strength and drifting back to a fuller build, she never lets her true power loose, and he wonders what actually motivates her when she uses it.
While the two indulge at a shop, Anko turns up to remind Choji of a meeting with Shikamaru. Once he leaves, Anko learns from the owner that sweet beans have run dry: bandits have been raiding deliveries to resell the beans at a markup during poor harvests, squeezing shops all over. With a shipment due the next day, Anko and Chocho set out to guard it.
The delivery comes under attack, and Anko warns that the beans must not be harmed. Chocho's partial-expansion strike tears up the road and topples the cart, and the danger to the beans finally triggers her protective instinct, letting her slip into Butterfly Mode and awe some of the bandits. When debris pins Anko, though, Chocho cannot summon the form again to break through.
Anko tells her to cook the beans and spare ingredients into paste to restore the calories her jutsu burns. The aroma draws the bandits, but Chocho evades them, eats the paste, and recalls her father's words. Realizing she wants to protect Anko and the beans, she enters Butterfly Mode, routs the raiders, and frees Anko. Back home, her teammates and Konohamaru's squad hear how she caught the thieves.

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Akimichi Butterfly Mode is a secret clan transformation technique tied to Calorie Control that Choji teaches his daughter Chocho in this episode.
Chocho finally triggers Butterfly Mode when her instinct to protect Anko and a stolen bean shipment from bandits kicks in during an attack on the delivery.
Choji bribes Chocho with sweet bean soup because she initially has no appetite for training in Butterfly Mode.
Bandits have been raiding sweet bean deliveries to resell them at a markup during poor harvests, squeezing shops across the village.
Chocho must eat bean paste made from spare ingredients to restore the calories her jutsu burns before she can enter Butterfly Mode again.
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