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.
A possible 'Chan Ko Myanmar love story' could be that Chan was a young fisherman and Ko was a girl from a village near the river. One day, Chan's boat got stuck near Ko's village. Ko helped him and they started talking. They found that they both loved the same old Myanmar folktales. As time passed, they fell in love. But Ko's family was against it as they thought Chan was too poor. But through Chan's hard work and their unwavering love, they finally convinced Ko's family and lived happily ever after.
There might be a Chan Ko Myanmar love story where they met during a religious festival. In Myanmar, festivals are full of color and life. Maybe Chan and Ko saw each other among the crowd during a pagoda festival. Their eyes met and that was the start of their love story.