1. Len receives the miniature bicycle from Neru as a present. 2. Len is happy and smiles at Neru. 3. Neru is happy that Len is happy. 4. Rin points to herself, implying her question to Neru about her own present, since she has the same birthday as Len. Neru turns away either cause she completely forgot about Rin having the same birthday, or because she doesn't like Rin since Rin messed with her some strips ago about her relationship with Len.
Neru turns away either cause she completely forgot about Rin having the same birthday, or because she doesn't like Rin since Rin messed with her some strips ago about her relationship with Len.
My guess is, it's the latter. Also, in panel 2, from the background I get the impression that Neru maybe imagines Len to be happier than he actually is.