You will have seen the symbol of “Aiai-gasa” in Japanese animation and manga. You already know that this mark implies the mam and woman are already or almost in a romantic relationship. Do you know that there are 7 patterns in “Aiai-gasa”?
Japanese people generally call someone by their last name, especially when we address classmates or regular friends. Really close friends call each other by their first name. If a boy and girl call each other by their first names, you could assume they are dating.