Hatsukoi: Otosan, Chibi ga Inaku Narimashita

Yukiko and Masaru have been married for 44 years, and have three children who live separately. The couple enjoys their days, and everything seems to be going well, until one day Yukiko tells her daughter Naoko, that she wants a divorce...
(Source: MDL)
~~ Adapted from the manga "Otou-san, Chibi ga Inakunarimashita" (お父さん、チビがいなくなりました) by Nishi Keiko (西炯子).