A hot spring spirit wakes up as a child and needs a human boy to help her remember who she used to be. The show turns that premise into something genuinely warm, not precious or calculated. It's a comfort watch that never mistakes cuteness for depth, building a real mythology around what it means to be forgotten, even if the middle stretch loses focus.
Hakone is a hot spring spirit who wakes up at a resort after centuries of sleep, trapped in the body of a small child despite her ancient age. When Touya, a high school student, discovers her naked and confused in the bathhouse, he gets dragged into her mission to recover the spiritual powers she's lost during her long dormancy. What starts as an awkward first meeting becomes an unlikely partnership as Touya helps Hakone navigate the modern world and reconnect with her supernatural heritage. She's impulsive and childlike in the most literal sense, while he's stuck playing the responsible adult in their dynamic. Together they encounter other spirits, tackle bizarre situations at the resort, and slowly rebuild what made Hakone powerful in the first place. The comedy comes from culture shock, slapstick moments, and the constant tension between Hakone's ancient wisdom and her toddler-sized body. It's lighthearted supernatural slice-of-life that doesn't take itself seriously, perfect for when you want something funny and charming without heavy stakes or complicated drama.