Sequel of this anime can be done with a 17 yrs leap. The sequel will only take Rumbling Hearts Season 1 ending & its spinoff Akane Maniax endings as its prequel. Plot:- 17 yrs later, a 11 years old orphan Yamasaki Narumi, primary grade school student studying in Nahara School, finds out about his parents death. Takayuki Narumi & Mitsuki Hayase Narumi were killed while 1 year old Yamasaki survived in an accident 10 yrs ago. Yamasaki finds out about Shinji Taira, now a teacher at the same high school where Takayuki Narumi & Mitsuki Hayase were high school students 17 yrs ago. Yamasaki gets transfer to the very same school. After identifying Yamasaki as son of Takayuki & Mitsuki, Shinji calls Haruka Suzumiya(now Haruka Izusu) & Akane Suzumiya(now Akane Gouda). When they all hear about the death of Takayuki & Mitsuki, Haruka ends up adopting Yamasaki as her son & Yamasaki gets to know more about his deceased parents.