Comment by Slayz on Kozure Omega to Boukun Yakuza - Chapter 5.5

For anyone who interested in the "happy birthday" manga is from :
1. "Tayori Tayorite" 
2. "Sayonara Hatsukoi Mata Kita Nande"
3. "Sunde Mitsukete Kirameite"
4. "Papa to Boku to Kazoku ni Natte yo"