Punch Up

Volume 1:
1-2. Punch Up (act 1-2)
Motoharu is an openly gay, elite architect whose preference is the athletic, pretty boy type. While checking out the well-built construction workers at his favourite hunting ground—the construction site—he found his missing wayward cat Shinobu. A hot-tempered, sarcastic, bratty iron-worker named Kouta insists Shinobu is Nyata his cat. Will Maki be able to tame the vicious pet(s)? (features Misono from Mayou Otoko)
3. Punch Up (act 3)
Kouta feels uneasy after finding out about Motoharu and Shinobu's one night stand.
4. Sweet Train
Junsuke presents Shinobu a trip to Sapporo by train as a belated birthday gift. (features Shinobu and Junsuke from Play Boy Blues)

Volume 2:
1-2. Punch Up (act 4-5)
Motoharu learns a little bit more about Kouta's past from the youth's ex-classmate.
3. Ohki Kouta's Interview
A little interview detailing Kouta's job.
4. Punch Up (act 6)
Kouta runs into his brother's ex-partner and is made to remember his painful past.
5. Honeymoon
Fukazu Yuya is going out with Kouta's brother who is a cross-dresser. This chapter focuses on Kouta's little known complicated past.

Volume 3
1-3 Punch Up (act 7-9)
Kouta and Maki happily living together. Are they? Maki feels insecurity about sudden re-appearance of Kouta's first love, Yuya. While Maki tried to let confused Kouta sort out his feelings, catastrophe strikes...!
4. Maki Motoharu's Consolation

Volume 4
1-3 Punch Up (act 10-12)
15 years old Kouta is fighting to differentiate himself from his 19-year-old self! Will he ever regain his memories? Does he want to?
4. My Motoharu is not like this XXX
Kouta is worried because Motoharu seems to be less perverted than before.
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Separate extras:
'Punch Up Returns 2015' - oneshot from Pink Gold 6
Hontoni atta kowai Punch↑ - from Pink Gold 7