Dino in his room unleashes his box weapon but is accidentally swallowed by it. One by one, Tsuna's friends are swallowed by the box weapon until Tsuna and Basil are the only ones who remain.
Avec l'arrivée de Dino, la formation aux boîtes Vongola devrait pouvoir commencer, mais un incident plonge la base dans la terreur : un monstre d'origine inconnue y rôderait et dévorerait ses victimes.
I ragazzi si preparano per festeggiare l'arrivo di Dino, che mentre si trova nella sua stanza utilizza una box e causa un disastro.
十年后的迪诺来到了彭哥列基地，他骑乘自己的匣兵器“天马”的英姿，令人感觉到十年岁月的流逝。里包恩之所以要众人等明天再进行匣兵器修行，似乎就是因为请到迪诺前来帮忙。然而没有部下陪同的迪诺，还是和十年前一样频频出错，虽然他带了特别的匣子来帮阿纲等人修行，这个匣子却令彭哥列基地陷入天大的混乱。
