If you want a funny short 13 episode romance anime with heartwarming, adorable moments that makes you have butterflies, with a great and cute storyline and characters that you will love watch My Little Monster. In this anime you might not even ship the main couple because there's rivalry that makes you root for both sides.
If you want a romance anime that has 25 episodes with a longer and more complex storyline that at some parts plays with your emotions, makes you feel angry, happy or even sad at times and has some characters that you will root for and some you despise go for Toradora! In this anime there is only one main couple so you don't have to worry about who to root for.
Amagami
Anohana
Clannad/Clannad After Story
ef A Tale of Memories/Melodies (picture)
Gosick
Inari, Konkon, Koi Iroha
Kokoro Connect
Myself;Yourself
Nagi no Asukara
Sakurasou no Pet na Kanojo
Toradora
Yamada-kun to 7-nin no Majo
uhm...
fruit baskets
S.A.O
clannad
Kaichou Wa Maid-sama
Wolf Girl and Black Prince
Say "I love you".
Toradora!
Kimi ni Todoke
my little monster
ouran high school host club
special a
blue spring ride
kamisama kiss
lovely complex
golden time