If you're looking for manga similar to Sekai-ichi Hatsukoi: World's Greatest First Love - Proposal-hen, you might like these titles.
When I came down with a cold and was bedridden, a beautiful woman wearing cat ears appeared before me. But it turns out that she was actually my pet cat...?! She's usually calm, cool, and collected, but put cat ears on her and she's fawning all over me. How will my love with this mysterious beautiful woman turn out?
Eiji is a high schooler living with his father - a novelist who can't sell his works. Eiji is rather anti-social, nerdy, and worst of all, poor. But he is a kind, honest young man who never forgets how his deceased mother taught him to be compassionate towards others. He (along with everyone else) deeply admires his classmate Aoi-san, the daughter of the president of a large corporation. But Eiji had never been able to face her due to the enormous difference in their social standings. One day after school, he returns home to find that Aoi had come to visit him, and there, she says a few words that astonish him even more than he already is...
"I am your fighter"--In front of Aoyagi Ritsuka, there is a boy that named himself as Loveless fighter -- Seiryo Yukiharu -- appears.Since he has the same voice as his deceased brother, Ritsuka opens his heart to Seiryo's tenderness. But, when he felt the warmth of Agatsuma Soubi's hand, he was attacked by anxiety. Was it okay to let Soubi's hand go? Who is the partner with I want to have a strong connection? When Ritsuka hesitates with this, real love and bonds are tested.
Hatsumi Narita lives in a typical company housing complex with her seemingly typical family, but the dramatic turn her life is about to take is anything but, well, typical. Her precocious younger sister Akane is way too popular with boys, her childhood friend Azusa, now a hunky male model, might want to ruin her life, her super-mean and very privileged neighbor Ryoki considers her his slave, and her dreamy older brother Shinogu might not be what he seems at all. What is a hapless heroine to do?
Ren Narita never believed in love at first sight, until he came across the sweet and lovely Tsubasa, immediately fell for her, and asked her out without thinking. She tells him they should start out as friends, but then she comes out and lets him know that she has six different split personalities...?!
Two boys lived in a village: Yoshiki and Hikaru. The two did everything together...until the day Hikaru was encompassed by a mysterious light. That was when everything changed—Hikaru most of all. Yoshiki still wishes from the bottom of his heart to always stay by his side...but is there even a Hikaru left to be with?