The World God Only Knows/Heartwarming

""If the world is perfect...then there wouldn't be a need for love now would there?""
 * The climaxes of each of the heroines arcs.
 * Ayumi, a cheerful, Book Dumb, Genki girl who's an ace in track and field but secretly has a lack of self confidence in herself to the point
 * Mio, a short, snooty rich Tsundere who acts high and mighty who
 * Kanon, a popular idol with some Yandere issues over people not noticing her.
 * Shiori, a shy bibliophile who doesn't talk so much and loves books to the point
 * Kusunoki, a tomboy and Captain of the Girls Karate Club that detest femininity in order to inherit her family's dojo.
 * Haqua, Elsie's demon best friend and genius in the Weiss hunter squads who Elsie believes is the greatest demon. In reality
 * Chihiro, an average girl with no interesting traits who secretly wishes to be special to the point
 * Jun, a bright, idealistic teacher who truly wants to help her students to reach their dreams,
 * Tsukiyo, a loner who rather watch the stars with her doll in her own world rather then real life because she seen the it's ugly side after her parents divorce.
 * Minami, a middle schooler who is undecided if she should continue Swimming lessons as she's afraid of change.
 * Tenri, a shy girl who fell in love with Keima as a child but is afraid to admit it.
 * Rieko, a grandmother who longs for the past that
 * Sumire, is the daughter of ramen chef who owns a failing Chinese restaurant and wants to help him by creating new ramens for the restaurant.
 * Nanaka, a classmate of Tenri's who so obsesses with her pride of being an champion shogi player that she won't stop challenging Tenri in shogi until she wins.
 * Yui, a rich girl who is controlled by her mother to live a life that doesn't allow her any freedom to choose.
 * Hinoki, Kusunoki older sister who acts like Crazy Awesome Cool Big Sis to everyone including Kusunoki. In reality,
 * Akari, a dirty looking scientist who tries to create the perfect human being because human's are flawed. Yet
 * Haqua telling  at the end of chapter 144.
 * Keima's Character Development, how he goes from a Jerkass to a Jerk with a Heart of Gold.
 * One moment was when he was talking with Akari and realizes that living in an imperfect world isn't so bad.

"Chihiro: I guess I've been randomly confessing to guys so much that anyone will do. Ayumi: You're wrong. This time your love is genuine. I'll be rooting for you."
 * Ayumi's answer to Chihiro in chapter 157 is one to anyone who remembers the reason she had a weiss inside.

"Haqua: Heh. You haven't changed at all."
 * Shiori's story "About me".
 * Docrow Skull's You Are Better Than You Think You Are speech to Haqua, and the returning of her scythe.
 * Tenri using her magic tricks to cheer up Keima while he's depressed  in chapter 168 and saying she loves him just the way he is.
 * When Haqua and meets up with Keima for the first time in a week, there is something distinctly heartwarming about how she just smiles and goes along with his zany plan instead of complaining like usual.

Meta:

 * Wakaki's own life story is pretty heartwarming too - after being given the Shogakukan Comics Award grand prize and being told his future for the next ten years were anticipated, multiple oneshots of his were shot down. He tried to work as an assistant, but it didn't get him anywhere, so he returned to his hometown of Osaka depressed. He then began to start a life as a hardcore shut-in. Thirteen years after the prize, one of his oneshots, "Holy Crystal Albatross", got published, and got quickly cancelled because of "low popularity". His bank balance dipped to below 10,000 yen - if he didn't get any money soon, he'd fall into debt. Finally, he submits The World God Only Knows and it becomes a smash hit online. Though it came close to being cancelled, it struggled through - and Wakaki managed to save his own life.