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.
Momo's stealth may have malfunctioned due to her focusing too much on the indirect kiss.
What a bother! Why are you able to see me now, of all times!!*gulp*She didn't finish her water... It'd be such a waste if I just threw it away...Here I go~Good luck, Senpai!So there you are, Momo~Well... h... here goes-...Ah!I'm off!I was suddenly able to see you for some reason!