Opening Credits:
"Summer Time" by NEWS

Waking Up:
"Introduction for Kingdom" by Koda Kumi
That's really grand for a waking up song ^^"

Falling in Love:
"We are not alone" by Ootou Fumi
That's creepy for a love song =.="

Fight scene:
"Baby! Koi ni knock out!" (Baby! Love is like knockout) by Pucchimoni.

Breaking up:
"Song for You" by Kimeru

Getting back together:
"A Whole New World" by Disney's Aladdin

Secret Love:
"Your Seed" by Hey! Say! JUMP

Life's okay:
"Make me smile" by SMAP for Akazukin ChaCha

Mental breakdown:
"A Uta" (Love Song) by GreeeeeN

Driving:
"I Still love H.E.R." by Teriyaki boys featuring Kanye West

Flashback:
"Oosaka Rainy Blues" by Kanjani8

Partying:
"Furare Pattern" (Breaking up Pattern) by Berryz Koubou

Happy dance:
"Summer Madness" by LEAD

Regretting:
"Colonel Hathi's March" by Disney's The Jungle Book

Long night alone:
"Complete" by So Nyeo Shi Dae

Death scene:
"Be our guest" By Disney's The Beauty and the beast
What? O.o

Ending credits:
"Do yo thang" by Morita Go from V6