 If you liked
Tegamibachi
|
 ...then you might like
Toaru Hikuushi e no Koiuta
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Toaru Hikuushi e no Koiuta and Tegami Bachi both strike me as adventurous series in an open world of wonders. The main protagonists train in a profession and hope to make their dream into a reality.
Both series have a solid foundation of their worlds with mechanics and backgrounds. There are rivalries going on between sudden characters as well. Toaru Hikuushi e no Koiuta has the additional element of romance while Tegami Bachi possesses more of a comedic background.