I wish the anime would continue :( It sounds like that it wasn't very well received so it doesn't appear that there will be a continuation. The English translations for the manga is also taking forever, I want more of my delicious FAL oneesan and Funco chan T_T
the "to be continued" means the story will continue in ch 21 of the regular manga. This dojin was made as a fan service filler for chapters 20 and 21 to match the bath scene that was only shown in the anime hence it's labeled as ch 20.5. The author does mention to look forward to the next issue of "ecchi-na"