Ixion Saga DT, Outbreak Company Recommendations
Ixion Saga DT and Outbreak Company both deal with a fantasy world in which characters are enlisted to help others. The main male protagonist is familiar with the otaku culture because of his own experiences.
There is a lot of parody and comedy going around both series. The main male protagonist also has odd fantasies regarding many characters on various occasions. There is some "action" but most of it is presented in a fun style rather than anything serious. Most of the episodes are also standalone rather than a linear arc.
similar situation where otaku is thrown to another world,but in Outbreak Company,there are more moe and fanservice.Don't expect the same comedy if you have watched IXDT,but if you prefer cute girls and fanservice i recommend Outbreak Company for you.
BOTH Protagonist are OTAKU's and Both Protagonists travelled across different dimensions.