If you're looking for manga similar to Boy of the Star Garden, you might like these titles.
Yuzu is bullied visciously at school because she is mute. Noone seems able to protect her. Not her teachers or her family, from whom she hides what she's going through. Not even her brother, who's starting to suspect something is seriously wrong. So when the mysterious invisible creature known as Haita offers to take over Yuzu's body, Yuzu accepts, changing her life in ways she can't begin to imagine.
The first place a dead soul arrives after passing is the Twilight Market, where the living and dead intersect. Eleven short stories about those who have died, those who are dying, and the ones still alive as they all meet in the Twilight Market.
How reliable would you say your memory is? As humans, our minds can omit memories. Memories can become idealized. Sometimes, they can even be entirely fabricated. There are various ways by which one's recollection of past events can become distorted. One could even say that it is a type of mental defense mechanism meant to protect us. But what if you had the chance to see your memories in their original state, unblemished and untouched...? Would you take it? Meet Hakucho, the hippocampus and their assistant, Rohen, two mysterious individuals that live and work at an old-fashioned cafe that's more than meets the eye. Their shop comes to those plagued by their past, offering a chance to see the truth behind their memories. When restoring a client's memories, Hakucho summons a mystical creature from their ancient pipe. The creature enters the client's mind, scouring its depths to reveal that which has become obscured. However... sometimes, the truth is perhaps best left forgotten.