22-year-old Hazuki lives a boring life in an apartment filled with plants, but secretly he couldn't care less about the vegetation, for the highlight of the young man's day is buying the items from cheery Rokka, a widow who runs the flower shop nearby. So that he can spend more time with her, Hazuki eagerly accepts a job working part-time at the shop, but after months of working with his crush, the man can't seem to muster the courage to confess his feelings. And it's not just his abrasive personality getting in the way of his ideal relationship - the ghost of Rokka's dead husband haunts the shop and is determined to keep all potential suitors away from his wife. Despite this unexpected obstacle, Hazuki continues his attempt to woo the older woman and free her from the ghost of her past.
It struck without warning one fateful day in Tokyo – a massive 8.0 earthquake rocked the city and caused massive devastation and death in its wake. Having taken her little brother to an exhibit that day, young Mirai and he find themselves alone and with no one to turn to – until a kind delivery woman named Mari promises to help them get back to their family. Now, the three travel the ruined cityscape and brave immense danger as they try their best to make their way home.
What strikes me as similar between these anime is how they both deal with relationships through the lens of life and death. Tokyo Magnitude examines family/sibling relationships, and Natsuyuki examines romantic ones, but I think fans of either one would enjoy both.