Koibana Onsen

Despite having been dumped by his girlfriend, Akiyama doesn't want to cancel their reservations to a famous onsen resort popular with couples. Deciding to go alone, he finds 3 sisters taking care of the inn. Later on, the sisters call his ex-girlfriend to come and patch things up with him.... However, will he still want to make up? (Extra chapter in volume 3 remains untranslated).