An unlikely couple in Japan is making headlines for their 60-year age gap. 23-year-old Kofu has been in a relationship with his classmate’s 83-year-old grandmother, Aiko, for more than six months.

An anonymous love letter addressed to P5 student Lam Siu-wai throws her and her classmate So Hoi-shing into turmoil. The duo decides to find out who wrote the letter. Thus begins a journey whereby the ...