Suzuka: Season 1, Episode 10
When Suzuka goes home to visit a certain Kazuki, Yamato chases after her, and eventually finds her house, which turns out to be very big. At the doorstep, he meets Suzuka’s sister, who takes him to see Suzuka and Kazuki. When he realizes Kazuki is dead and Suzuka was visiting his grave, he goes home without even letting Suzuka know he was there. In addition, he learns that Kazuki was also a rocket starter, and that he greatly resembles him.