both are quite different in terms of story, but they both have very similar atmospheres. they're both extremely dark and gritty with a focus on bullying and violence. i'd also say they both make you feel quite heartbroken and empty by the end.

- both have unreliable narrators and major plot twists
- both make you question everything you think you know
- both have hidden connections between the leads
- similar atmospheres imo

similarities:
- cute loyal dogs
- emotional tearjerkers

differences:
- young girl owner vs. man owner
- 10p is about a girl growing up, while hachiko is about a man's death

although the guest is more about demons and possession, and signal is more about time slips(?), they both have similarities in terms of the main three working together to solve various crimes. they both also have similar mature / dark vibes with heavy themes.

- both are really short miniseries
- bromance
- mischievous antics (but hello, my youth is FAR more realistic)
- both are quite comedic

- both have fantastical worlds with different types of creatures in them
- two humans who act as "parents" to a cute baby creature
- exciting action and some comedic moments