This is Futari Shizuka

Sex Friend Nurezakari is the story of an old friend, Tsutomu, who pays a visit to a couple then disappears after one night. He leaves behind a mobile phone, and the couple set out to find him and return it. Along the way they meet up with another couple taping themselves having sex. The four of them continue the journey to find Tsutomu. When they arrive at his home, his parents inform them that he was killed in an accident some years previously. What happens next is both bizarre and strangely heart warming as the four friends play a baseball game with the ghost of Tsutomu and thus seal their friendships for good, as all of them discover more about themselves and each other.

Older brother Kenichi and younger brother Takashi had not seen each other for a while, but they meet at their estranged father's funeral. The father had moved to a small town and remarried and has a daughter, who is supposed to be their half-sister. Her whereabouts are unknown, as she left home at a very young age. One of the brothers mistakenly meets her, under very strange and disturbing circumstances...

After attempting to meet someone new on a dating website, Chihiro starts talking to Makoto, who is asking around about a string of suicides. She agrees to meet with him, as she knew one of the girls that recently passed. After the two begin to connect a bit, Makoto gets an e-mail from Chihiro, saying she doesn't see a purpose to continue living.

Nagano has had a sickness of the heart for 40 years and has been hospitalized at the mental hospital in Fukushima. However, during the evacuation when the Great East Japan Earthquake hit on March 11, 2011, knowing that he’s already completely healed, he makes his way back out to into the world. Having been hospitalized from when he was in his teens until his fifties, his story is like that of Urashima Taro, the Japanese fisherman who went beneath the sea as a young man and returned to an unfamiliar world. However, his heart from long ago is for the first time full of feelings to meet the woman he loved. Before long, Nagano learns that the woman has taken refuge in Tokyo and lives with her son and his wife, and sets out on a bike headed for Tokyo.

Miki has a good job and works in an office. She's been dating Ryosuke and they're happy together... except for the fact that Miki is also in a relationship with her college professor Tanaka. Tanaka is trying to break up with Miki because of his wife, but Miki won't hear of it. Ryosuke is also unfaithful, and he has a one-night stand with Chihiro, who also has a boyfriend. The plot thickens when both girls discover they are pregnant, and don't know who to name as father. This romantic drama about relationships is proof that love can also come in squares.