Tengai Retrogical

Tengai Retrogical (天外レトロジカル) is a Japanese manga series written and illustrated by Rin Asano. It was serialized in Mag Garden's Monthly Comic Blade magazine from 2002 to 2006 and published in seven volumes.

Publication
Written and illustrated by Rin Asano, the series began serialization in Mag Garden's Monthly Comic Blade magazine in 2002. It completed its serialization in Monthly Comic Blade in 2006. Its individual chapters were collected into seven tankōbon volumes.

In March 2004, ADV Manga announced that they licensed the series for English publication.

Reception
Mike Dungan of Mania described the manga as "a very enjoyable story that is equal parts action, horror, fantasy, science fiction, historical drama, and comedy." He commended the manga's characterization, stating there was an "air of confidence in both the art and the storytelling". In Manga: The Complete Guide, Jason Thompson praised the artwork, though he felt the plot was too vague and withheld too much information from the reader. Liann Cooper of Anime News Network described the characters as "generic" and the environments as "bland". He concluded by describing the manga as "so unimpressive that just ends up being incredibly boring".