Irises Bloom and Cherries Grow (アイリスが咲くとさくらんぼ成長) is the fourth episode of Mega Man: Upon a Star. It came out in 2015, after Konnichiku Otaka met with Reed Productions and agreed to make more episodes of the OVA. This episode is about Japanese viewing events.
Yuuta and Akane pull Mega Man, Roll, and Proto Man out of the game world. They tell them they're going to somewhere special. Mega, Roll, and Proto wonder where that could be. The scene shifts to show them at the Hanami. Yuuta, Akane, and their visiting brother Ayane are watching cherry trees with their parents. Then the kids drag Mega, Roll, and Proto to the carnival there. They get to watch a parade, listen to folk songs, play games, go on rides, watch a beauty show, and eat food. Along the way, Yuuta, Akane, and Ayane explain Hanami and the flowers blooming.
A time card shows, then the scene shifts to Akane pulling Mega Man and Roll out of the game world to go to Umemi along with her and Yuuta. The kids teach Mega and Roll about plum blossoms and how it's great to view them.
Another time card shows, and the scene shifts to Yuuta pulling Mega Man, Roll, and Proto Man out of the game world to go to Momijigari. Mega, Roll, Proto, Yuuta, and Akane view the leaves and have fun playing in them.
A final time card shows, and the scene shifts to Yuuta and Akane pulling Mega Man and Roll out of the game world to go to another Otsukimi. They view the moon and eat dango. Yuuta and Akane put Mega and Roll back in the game world again, and the episode ends.
- This episode is the shortest.
- This episode has no action sequences in it, being a slice-of-life "breather" episode to satisfy Konnichiku's "festival needs", as if Matsuri Madness wasn't enough for her.
- This episode is similar to the Otaka Mega Man Shorts that feature Yuuta and Akane, in that there's no action and there's more of the things they do at events.
- This episode marks the first physical appearance of Ayane, who previously was heard in Wishing Upon a Star.
- This episode is the second time Otsukimi is shown, the first being Future Beware.