Hatsukoi to Taiyou

Koharuko, a 6th grader, is popular with girls because of her mature personality, but boys always pull pranks on her. She doesn't like how childish boys are, so she wasn't interested in anyone. On the other hand, since she fell for Ichijou, a brazen boy, everyday has been dazzling. It's a real love story of a new generation set in elementary school!

(Source: Shueisha, translated)

Included one-shots:
Volume 2: Hatsukare Biyori
Volume 4: Kimi ni Ai wo Hanataba wo
Volume 5: Hunny Bunny
Volume 8: Only Likey