Pairing: Nanase Haruka/Matsuoka Rin

From September Scanlations:

Haru and Rin are professional swimmers who have a friends-with-benefits situation going on after they fall into bed together following a fiercely fought tie-win–until out of the blue, Haru suggests they break up, with no explanation.

Pairing: Haruka x Rin

From September Scanlations:

Side Dakuzoh: Devastated by his father’s death, young Rin weeps in the royal library and accidentally summons a djinni named Haru, who offers to grant him a wish.
Side Eo