Oops, it doesn't look like 'kokoro day' is a national day..

Other days

kiss a ginger

Kiss A Ginger Day
hiv awareness

Hiv Awareness Day
law

Law Day
pick me

Pick Me Day
eat what you want

Eat What You Want Day
offer

Offer Day
martini

Martini Day
comfy

Comfy Day
first love

First Love Day
ponytail

Ponytail Day