Nishizawa Kazuki is probably best known as the younger brother of Ayumu, though he's also a close friend of Wataru's. He's got a pretty straightforward love story—about a year before the main events, he spotted Nagi struggling to retrieve a balloon stuck in a tree and fell for her immediately. When he ran into her again at Wataru's store, he took his shot, inviting her out for a walk and eventually confessing how he felt. It worked out.
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