This manga is astonishing. It takes the super cliched premise of the body swap, and tears out the ending.
There are no wacky hijinks. No embarrassing compromising moments. Just the sad depressing daily life of two kids that have had their lives and families ripped away from them and are stuck living out each other's identities. What should have been a funny short story has become the miserable daily life of two transgender children that can't live with their own families, be themselves at school, or even pursue a love life. Years continue to pass, but they cling to hope of returning to normal, and so they continue the masquerade, terrified of screwing up each other's lives if they dare to drop the act.
The daily struggles are surprisingly lifelike, and very relatable. In addition to coping with transgender life and losing their identities, they face the confusion and hurt and thrills of growing up. Only, they're growing up in the wrong body, and neither of them are living the childhood they were meant to have.
Yuuta cringes when he isn't acknowledged as a boy. But he takes it in stride.
Yui finds herself torn up inside over a love that seems hopeless when he doesn't have the body of the girl she really is.
Their tears and struggles to keep hold of who they are and keep themselves secret, living one another's lives, make Bitter Change one of the most compelling manga stories I've ever read.