The infant son of Haruka Sawamura and grandson to Kazuma Kiryu, Haruto was conceived during Kiryu's time in prison shortly after the events of Yakuza 5.
Kiryu first met him at the Touto University Hospital after he discovered that Haruka was left in a coma and put under intensive care. Concerned that his biological father is still unknown, Kiryu wanted to take care of him, much to Akiyama's disagreement as he's not Kiryu's biological relative, causing him to fight Kiryu.
In order to avoid child services, Kiryu decided to take Haruto to Hiroshima to track down Haruka's whereabouts during her escape. While traveling the streets of Hiroshima to search for Haruto's father, a local bartender named Kiyomi Kasahara helped Kiryu in taking care of him. It is revealed that Haruka conceived him during a one-night stand.
After Iwami's defeat, Haruka moves back to the Morning Glory Orphanage with Yuta and Haruto. The duo along with their fellow orphans help Haruto to walk. Haruto notices Kiryu watching him but Kiryu steps away from the open before Haruka can see him. Haruto struggles walking on his own and fell but Haruka continues cheering him and managed to get back up his feet and tries to walk towards her.
- Haruto's name is initially only seen in hiragana, which is normal for babies. Haruka later reveals that the kanji characters are 遥 from her name and 太 from Yuta's.