It's about first love (obviously if you see the title lol) and how no matter what happens in life, one never really forgets even two decades later. The drama moves at a good pace and has interesting supporting characters. It has beautiful cinematography as well. The interaction and chemistry between the two are excellent. Both Satoh Takumi and Hikari Mitsushima display complex emotions throughout. Each scene of their meetings was natural and there are many memorable lines in the script as well as emotional silent scenes that do not need words but are left to the virtuoso of the actor such as Satoh Takumi.

The "teenage" actors did an excellent job as well demonstrating the zest, excitement, and energy of a first crush, a first love. The drama does a great job of balancing the past and present in a non-confusing way.

The music (two songs) is from the ever-popular Utada Hikaru and this drama was inspired by those songs. Because of that, I read that this drama was top 10 in several countries and during the time it was streaming, it was number one in Japan. It was a success. I loved it, and I admit that I usually do not have the patience to watch slice-of-life or romance dramas but this is one to watch and share with those you care about.