Kindan no Koi de Ikou
Part 3 of 3 - The longer main story. The ending is a little melancholy but it shows Yato's enduring love for Hisako. She will eventually return to him and they can finally be together forever
Kimi Ni Koishitei Desu Ka.
Alt/full/long version of of Akuma ga Kitarite (So far I prefer Akuma ga Kitarite but both versions are very good)
Ningyo Ouji*
Summary from MyAnimeList.net This volume is a collection of 3 short stories. The first one is Ningyo Ouji, the tale of a mermaid, or rather merman, who falls in love with a human woman. The second is Kimi ni Okuru Hana wo Tsumu, where a boy who died loved a girl so much that he possessed her manager's body. Very sad. The third one, Sekai wa Futari de Dekite Iru, features a nympho succubus and a...priest!?
Pretty In Blue
From Covenant of Darkness: Face, body, and talent, all 3 are what conspires Misako’s love for the star of the basketball club, with a genius ability and super beautiful Urasawa-kun. However, Misako's first and last profession of love in her lifetime was drastically discarded. Strangely, Urusawa-kun decided to model nudely for an art exhibition in hopes to winning a prize because he has an eye for that thing. The lingering affection is banned and the conditions that sends Misako's heart to abide.
Watashi No Oujisama
Summary from MyAnimeList.net 1) My Prince (Watashi no Ouji-sama): A rich man and a poor man appear before Hanako, an office lady who used to be rich. She wavers over which man to choose.
Koakuma to Meromero Tengoku
Sono Me, Kuchi hodo ni
Summary from MyAnimeList.net Sono Me, Kuchi hodo ni. (その目、口ほどに。, Your Eyes Speak to Me) He is, by nature, a quiet man—but when he open his mouth, he always go right to the point. "In brief, would you marry me?" "You really are an idiot!" But why doesn't it surprise me at all? He always was like that, so I can't imagine him differently. He uses his eyes instead of his mouth. Oide, Boku no Kotori (おいで、僕のことり, Come Closer, My Little Bird) He filled out our marriage form without my consent. Then he hands me a completed divorce form. He calls himself an irresponsible man, yet he's always by my side when I need him. What am I to think about this contradictory man? Masshiro na Sekai (真白な世界, A Pure White World) Day after day, he takes care of me. He never leaves my side and puts up with any inconvenience I cause because of an accident, because he feels responsible. But this kindness I wish to keep to myself is built upon my selfish lie. Contains the side story, Shinseki no Atsumari. (親戚の集まり。, The Gathering)
Desire Climax