You could look on platforms like Manganelo or MangaPark. Sometimes, specific manga titles might be exclusive to certain regions or require a subscription, so you might have to do a bit of searching.
I'm not sure specifically as I haven't read it. But generally, it might be about the journey of love, perhaps with characters experiencing different stages of love, from falling in love to facing challenges and then coming back to a deeper understanding of love.
In the novel, it turns out that one of the supporting characters has a hidden agenda that impacts the whole story. Also, there's a big twist about the protagonist's past that changes everything. But I won't say more to avoid spoiling it completely for you!
The ending of 'A Round Trip to Love' is a bittersweet one. The main characters finally find their way back to each other after facing numerous challenges, but there's a sense of uncertainty about their future together.