Letter Bee: Light and Blue Night Fantasy
Plot Summary: Letter Bees risk their lives to deliver the "heart" contained in letters. One day, newbie Lag is asked by the Bee Hive supervisor to deliver something to a girl named Elena. He's introduced to Darwin, who will guide him to his destination, and sets off in good spirits with Niche, but...!?
Other name: Tegamibachi: Hikari to Ao no Gensou Yawa, テガミバチ 光と青の幻想夜話