Journey to the Shore

Mizuki’s husband Yusuke went missing for 3 years. He suddenly comes back home one day and asks Mizuki to go on a trip with him. Their trip consists of visiting the people that helped Yusuke on his previous travel. While traveling together, Misuki sees, touches and feels what Yusuke did for those 3 years. Why did Yusuke suddenly come back home? What did he try to send to Mizuki?
(Source: AsianWiki)
~~ Adapted from the novel "Kishibe no Tabi" (岸辺の旅) by Yumoto Kazumi (湯本香樹実).