Since I recently picked up the 3rd omnibus of TLR the other day, I figured I’d do a manga to anime comparison of the introduction of best girl Yami.
In a drop-down of course
Her introduction story lasts a total of 4 chapters, and I’m pleasantly surprised at how much of that made it to the anime! (Since so many people say S1 has a lot of filler material)
- Change #1
The whole De-Vi-Luke scene with Lala, Zastin, and Mikan and Rito shopping with Haruna is completely anime original. In the manga, only the part where Zastin gives Lala her allowance and Rito leaving a store are shown.
- Change #2
The reason why Lala and Zastin are out has been changed. In the manga, Lacospo sends a transmission to Lala, informing her that he sent Yami to kill Rito. The anime has Mikan send them to get something that she forgot to put on the shopping list.
- Change #3
Manga Zastin gets hit by a TRAIN during his battle with Yami.
Yeah.
That changed.
He falls into a sewer in the anime. (The dub exclusive joke is just beautiful too 
)
- Change #4
Haruna shopping with Rito was somewhat reworked from an earlier chapter. She gets a Round-robin Christmas gift from Rito, which turns out to be the mug which she is shown looking at during the anime shopping trip 
- Change #5
Yami actually doesn’t have any panty shots during her introduction chapter in the manga!
Kentaro Yabuki mentioned (in the after chapter character description) that he felt panty shots during a fight wasn’t sexy, so she got a little special treatment during her introduction.
- Change #6
Motemesu Sempai hits on Yami, which she thoroughly declines.
- Change # 7
During the fight with Lacospo, in the anime, Rito blocks a second shot of Gamaton’s mucous from hitting Lala, and then lands a punch on his face. In the manga, Peke restored Lala’s outfit immediately, and she proceeds to clobber Lacospo into the next millennium!
And aside from a bit of changed dialogue, that’s it!