Since starting high school, Kyou Nukui avoids classes and immerses himself in composing music in his room. Sharing his creations online with the drawings of his sole friend, the mysterious 'Kiriyume,' Kyou introduces a new piece, TR03, under the simple moniker 'me.' Surprisingly, he receives a gracious email recognizing him as the talent behind TR03 and suggesting a meeting at a nearby park. Expecting one person, Kyou encounters three young girls—Jun Gotou, Nozomi Momijidani, and Sora Kaneshiro—who seek his help in organizing a concert at their orphanage, a converted church. Initially hesitant, Kyou is swayed by the girls' musical prowess and eventually agrees. Adapted from Sagu Aoyama's acclaimed light novel, 'Tenshi no 3P!' depicts how these three angelic figures reshape Kyou's world.