This episode’s about Risa’s birthday, after a little argument she got into with Otani, the crew decides to throw a party. Otani was nowhere to be found, Risa starts to realize she just can’t do it without Otani.
Then, as they watch the fireworks from the school’s rooftop (summer school apparently) Risa hears the Umibozu mail ringtone from her cellphone. Otani was just behind the door, and he gave her a nice bunny necklace, in compensation for that horrible cheap keychain he got for her earlier. He tells her that he’s already confessed to her then Risa realizes it wasn’t just a dream. After he suddenly kisses her, Risa just can’t help but to laugh and smile, it’s just the happiest moment of her life. That’s pretty much episode 18 in a nutshell.