If you're looking for manga similar to The God & the Flightless Messenger, you might like these titles.
Years ago, Izumo saved a child named Ryuta from a youkai. After promising to return and adventure with him in the future, Izumo leaves Ryuta and forgets about his promise. By chance, Ryuta meets Izumo again. Over the years, Ryuta never forgot about Izumo and trained hard to prepare for their adventures. Izumo claims to have no memory of his promise or Ryuta, but that doesn't stop Ryuta from embarking on a journey with Izumo!
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Both mangas revolve around Japanese mythology and youkai and both follow the "childchood promise" theme. Main characters follow the "calm and collected, who's cold at first but slowly starts to accept his feelings" & "clumsy but doing his best, bright and hardworking" trope. If you enjoy sweet bl romance I think both will be to your liking!
Deep in the mountains on the outskirts of a certain village, there lived a god called "Shiromen-sama". Hakumen has the power to turn all negative emotions, such as pain, sorrow, pain and loneliness, into fruit and throw them away. One day, a young human is picked up by Shiromen. He has grown into a splendid young man, and before he knew it, he began to harbor pale feelings for his face. However, a few years ago, the young man began to feel something strange in his body. A story of new love and love, spun by humans and gods.
Toono Itsuki is a university student who majors in folkore studies. He's currently headed towards his grandparents' hometown as part of his thesis' fieldwork. There, a local warned him to "not get close to the mountain on days when the rain is cold". Despite the warning, Itsuki still went towards it and there he met!?
Kizakura Suika is a middle school student who, due to tragic circumstances, lives alone. Every day, she goes by an old shrine, which is watched after by Yorozu, a boy who has been her friend since she was very little. One evening, during an encounter with the god of death, Suika discovers Yorozu's true nature as the god of the old shrine! Now that Suika knows the truth, she will either have to marry Yorozu or lose him forever!
As a child, Usagi Mitsuki made a promise to a crying girl that when she grows up he will marry her. When he finally becomes an adult, she appears again to make good on his promise, but much to Usagi's surprise "she" is a not only a he, but his family's shrine's goddess!
Lin Lu, an otaku, wakes up one day to find a strange beauty in his bed. The handsome stranger claims to be a River God and begs Lin Lu to adopt him.
Yuto is a typical high school student whose family just so happens to have had a long line of sorcerers as members. While in the family storage shed, he accidentally awakens a god who was sealed in a sword hundreds of years ago. Now, if only this mysterious god could remember who he is! Yuto names this extremely good-looking spirit, Jade. Stuck with an amnesiac god who's strangely attached to him, Yuto begins a clamorous life of high school, adventure and attraction.
Shiina Momose doesn't believe in fortune telling and the occult, but for some reason, she can destroy anything with a touch. One day while on her way to school, a young man approaches her and claims to be a God. Furthermore, he believes that he was guided towards her and for that reason he has become convinced that she should become his first follower! Naturally, Momose refuses; but when strange things began to happen... she can not do something about it!