I'm looking to review an anime every day this week, keep on the look out.

Futaba has just moved from the city to the coastal town of Shizuoka where she meets the eccentric Hikari, lacking self esteem and very introverted, Futaba is drawn into Hikari's diving club with a brother sister duo and a very unique teacher, Futaba's life of mundane is now a journey of beautiful friendships and discovering life through diving.
This is the most slice of life you can possibly get in anime, not surprising as it's the same author as Aria, an equally relaxing slice of life; this means that there is literally nothing really major going on and the only developments are the friendships on display and the lessons learned from it, but there is beauty in escaping into this kind of world as life continues to be challenging.
A dub would break the immersion so is not recommended assuming it has one.
Final Verdict: A wonderful story that is super relaxing and laid back with a friendship as beautiful as the very ocean, it's slow for a good reason so may not suit everyone, especially if you are after a more proactive experience in anime.