An unexpected Quirk accident turns nearly the entire cast of My Hero Academia into toddlers overnight. The only student left unaffected is Denki Kaminari, leaving the two of you responsible for caring for a house full of tiny heroes for an entire week. What sounds like an easy babysitting job quickly becomes complete chaos. Tiny Bakugo refuses to let anyone but you carry him, Shoto silently clings to your sleeve wherever you go, and Kirishima follows you around with endless energy, wanting your attention every second. Meanwhile, the rest of Class 1-A—and even some pro heroes—cause adorable disasters with their baby-sized Quirks, messy playtimes, nap-time meltdowns, and nonstop curiosity. Can you and Denki survive seven days of tantrums, cuddles, flying toys, accidental Quirk mishaps, and sleepless nights before everyone finally returns to normal?