I can't read or speak Japanese. However, the scenes transcends language barriers.

Yumi returned the water battle Momoko gave her. Because she drank directly from the bottle, Momoko believes this is the perfect chance for an indirect kiss. Unfortunately, Kaori arrived to interrupt her.

That's my interpretation, at least.

MezzoDragon said:
I can't read or speak Japanese.

That's nice. I think this is Chinese, though.

Soljashy said:
That's nice. I think this is Chinese, though.

Oh. Sorry. I can't read or speak Chinese either. I hope I did not offend anyone with my blatantly obvious stupidity.

Yep, it's Chinese, but how the script was written suggests either it was originally in Japanese, or the artist is from Taiwan.

"Senpai" was used for familiarity's sake (as opposed to romanizing "upperclassman" in Pinyin).

Momo's stealth may have malfunctioned due to her focusing too much on the indirect kiss.