Tegami Bachi is probably one of the BEST ANIME EVER. It has all the key components an anime needs to have.
Fabulous art: CHECK.
Epic characters: CHECK.
Dramatic and suspenseful storyline development: CHECK.
Charismatic scenery and setting: CHECK.
Action, plot twists and guns: CHECK.
Manly men vs. Childish hero: CHECK.
Hero who cries like a 5 year old: CHECK.
Fanatastic sound effects: CHECK.
Random cat-wolf-dog (?) animal-pet, whose name happens to be Steak: CHECK.
Addictive: CHECK.
Suspenseful cliffhanger ending, persuading you to continue on to the second season: CHECK.
BE SURE TO COMPLETE YOUR ANIME-WATCHING (of Tegami Bachi) WITH THE NEXT SEASON, 'TEGAMI BACHI 2: REVERSE.'
You'll be kept on the edge of your seat, satisfaction guaranteed. (: