Sister-in-law close coaching

Aoi and her husband, Shinichi, have been married for several years and have no children, but they are living happily together when their brother-in-law, Mamoru, who has just started working again, visits. "My boss invited me to play golf, but I've never played golf before..." Playing golf with your boss could affect your future as a working adult. Shinichi, who can't bear to see Mamoru like this, asks Aoi to be his ``coach'', but... Aoi starts teaching Mamoru how to play golf the next day. However, the two become very passionate about coaching, and the distance between the two becomes closer...