Mako Secrets - The last merman

After saving the earth from a natural disaster Rikki, Bella and Cleo are trying to get back into the normal life. Stressing about college applications and boy drama. However life of an no ordinary girl can never be normal and Rikki will soon realize gathering money for the college is the least of her problems. When someone from the past also shows up with few secrets of her own the mermaids are yet again swimming to the deep end of an adventure unknown.

(This is a fanfic of a show H2O that's slightly connected to the spin off Mako Mermaids as well.)