The end of episode 8, Where the three suicidal friends, realizing they succeeded and are all ghosts now, join hands and head down the street, singing loudly, off to presumably start a fresh new unlife, their friendship seemingly stronger than ever.
As sad as they are, many moments between Ikari and his wife. The way they talk about how devoted the other is, as well as Misae's final farewell
Kawazu's last meeting with Tsukiko at the end of the series. How much he has changed and whether he recognizes Tsukiko is unclear, but when they just happen to cross paths she immediately recognizes him; At this, he simply acknowledges her with a friendly smile without a hint of his earlier sleaziness and the two go their separate ways.
There's something very touching, though sad, about Tsukiko apologizing to her poor, long dead dog with a warm hug.