Hidamari ga Kikoeru
Kohei is hearing impaired and isolated as a result. People mistake his silence as elitism, so he's left out of activities and feels like he's bothering people if he asks them to repeat what they've said. But one day, a loud, carefree boy named Taiichi falls onto the roof where he's eating his lunch and befriends him. This is a really gentle and lovely story about first love, but it's more about friendship and trying to understand and bridge differences between us. ETA: All volumes of this manga are licensed in English
Kakko Warukute Kakkoii Kimi
This is so cute. Childhood friends get to high school, and then one starts to pull away from the other! He's upset about something ridiculous (his height) and eventually everything works out.
Step One
A grouchy geology club student (!!!) is playfully stalked by an underclassman and eventually they kiss against a wall.
Sore o Koigokoro to Yobu no Nara
A young man falls for a classmate's face but struggles with internalized homophobia. The classmate, who acts repulsed at first, is actually dealing with his own issues involving his looks, which have made him an outsider since childhood. Lots of pretty homophobic language, so be cautious. The relationship is nice, though, and their friend group is awesome.
Calorie
After giving up on the man he's loved for 15 years, a young man agrees to go out with their mutual friend.
Koicha No Osahou (tea For Two)
An uncultured young man is forced by his sister to join the tea club, where he meets his opposite: the poised and serious club president. I didn't care for this story much until the two got together and faced challenges as an established couple. Then I really enjoyed their relationship and the hurdles they got past!
Wild And Strawberry
Yuu asks a fellow student out on a whim and is shocked when he accepts.
Danshi Koukouseiteki Kazoku Keikaku!
A high school student is mistaken for a delinquent at school and avoided by his classmates. One day, a pudding falls on his head from an upper window and he insists on bringing the cook home to marry his older sister. This features the most adorable child character I've seen to date.
Lucky Number 13