Matataki no End Roll

Two eighteen-year-old friends embarked on a trip after they graduated. “This will be the last time before I let go of my feelings for you...” These were the thoughts of Liam, who had been in love with his childhood friend, Lucas, for years—a secret he had kept until one fateful night at prom, when he got so drunk that he accidentally kissed Lucas. As much as he tried to avoid it, he couldn't stop thinking about how these unrestrained feelings overwhelms him. “If things continue this way, we won't be able to remain friends anymore.” Having made the decision to give up on love, Liam planned a graduation trip with Lucas, hoping to create one last cherished memory together. They set off in a worn-out car with the sea as their destination, embarking on a journey where a different kind of love would blossom between these two childhood friends.

(Source: Tokuma Shoten, translated)

Note: Chapter count includes a bonus.