The ending point of the Tomo-chan anime in the manga can be a bit tricky to determine. Sometimes, the anime might condense or expand certain storylines compared to the manga. You might need to do a detailed comparison to figure it out precisely.
I don't know for sure who Tomo is in this context. It could be the name of a person who is the translator or the founder of the translation project related to these novels.
I'm not sure. 'Earth chan hentai manga' seems like an unconventional and perhaps inappropriate topic. It's not something widely recognized or commonly discussed in normal contexts.