Uraura Hikaru: Shinshin ni Mitsu

Overview

After breaking up with his beloved girlfriend Chizuko, Keisuke spends his days listlessly like the walking dead. One day, he meets a boy, Koushi, who claims to be the child of Chizuko and Keisuke. Keisuke is glad to have found a connection with her, but then he is told that Chizuko is dead. Koushi, who is being raised by his grandmother, wants to meet the recipients of Chizuko's transplanted organs. Why couldn't the two of them be happy? A summery family drama about a man who lost his one true love, and a boy searching for the memories of his beloved mother. (Source: Monthly Comic Garden, translated)

Source: AniList