The Dangers in My Heart - Vol. 2 Ch. 25 - I Pretended to be Calm

[dementati]

In my opinion, this is the moment where Yamada really starts liking him romantically.

 

[andrybak]

Really loving the vibe of these two. Also, it looked like Ichikawa unexpectedly landed a critical hit with the smile on that last page, lol.

In my opinion, this is the moment where Yamada really starts liking him romantically.

Indeed.

Spoiler: for anime episode s01e05

This moment of Yamada reacting to Ichikawa saying "It's awesome, right?!" is much more noticeable in the anime, where Yamada audibly gasps.

The rest of the comment is for people who are reading the manga a second time. I hope it's OK.

Spoiler: for chapter 27

The rough consensus on forums (here, MAL, reddit) is that this arc is when Yamada starts to realize that she likes Ichikawa. This page in chapter 25, the lift closeness in chapter 26, and the Milk Tea moment in chapter 27 all point to it.

Spoiler: for chapter 64

... and, as we later see in chapter 64, that Milk Tea bottle becomes pretty important.

Side note: it's also foreshadowed a tiny bit in Extra Chapter 17.4.