A prep school student "Masaki Michishita" is running as fast as he can to the restroom in the park when he catches sight of a nice guy "Takakazu Abe" sitting on a bench. Their gazes overlap. Abe asked Michishita if he wanted to play with him and invited him to a brief wrestling match. Michishita, who has a weakness for nice guys, readily follows him and ...... their great adventure begins! 
(Source: Official Website, Translated)

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Masaki Michishita, a "typical guy" enrolled in preparatory school, is running to the park washroom when he spots a man wearing a jumpsuit sitting on a nearby bench. The man, Takakazu Abe, then unzips his jumpsuit and exposes his penis, asking Masaki, "wanna do it" (&#12420;&#12425;&#12394;&#12356;&#12363;, yaranaika?). They then proceed to the washroom and have sex. 
(Source: Wikipedia)
 
Note: Published in BaraComi 1987 #2

Collection of Yamakawa Junichi one-shots published in Barazoku and Baracomi, including previously uncollected works. 
1) Chibi Bara Koushinkyoku (ちび薔薇行進曲); 1985 
2) Ore no Onanie Time (俺のオナニータイム); 1985 
3) Yarisugita Itazura (やりすぎたイタズラ); 1982 
4) Uragiri (裏切り); 1984 
5) Aniki ga Suki Nanda! (兄貴が好きなんだ!); 1984 
6) Umi Kara Kita Otoko (海から来た男); 1984 
7) Deka wo Yare (刑事を犯れ); 1982 
8) Mayonaka no Knock (真夜中のノック); 1985 
9) Bokura no Sugoi Yatsu (ぼくらのスゴイやつ); 1984 
10) Natsuiro Tenkousei (夏色転校生); 1983 
11) Otoko Shinji wa Tsuppashiru (男新次はつっ走る); 1984 
12) Kareinaru Fukushuu (華麗なる復讐); 1985 
13) Utsukushiki Yajuu (美しき野獣); 1986 
14) Otoko Gari (男狩り); 1983 
15) Barazoku Kakurenbo (薔薇族かくれんぼ); 1983 
16) Harenchi Kyoushi (ハレンチ教師); 1985 
17) Otokotachi no Natsu (男たちの夏); 1988 
18) Boku no Seikatsuron (僕の性活論); 1988 
19) Boy+Ai² (BOY+愛2); 1988 
20) Mazo no Yorokobi (マゾの快感（よろこび）); 1988 
21) Kouya no Hate (荒野の果て); 1988 
22) Soui wo Nugu Hi (僧衣を脱ぐ日); 1988 
23) Otoko no Yakusoku (男の約束); 1988 
24) Kizuna (絆); 1988
 
Previously uncollected works in the first volume: 
1) Hitotsu no Seishun ga Owatta (ひとつの青春が終わった); 1983 
2) Jigoku no Sisha-tachi (地獄の使者たち); 1983 
3) Kyouiku Jisshuusei Zecchousu (教育実習生絶頂す); 1983 
4) Shukuchokushitsu wo Osoe!! (宿直室を襲え!!); 1983 
5) Kairaku no Wana (快楽の罠); 1983 
6) Shi no Rondo: Ookami to Hitsuji (死のロンド -オオカミと羊-); 1984 
7) Netsuki Rider-tachi (熱きライダーたち); 1984 
8) Yukemuri no Naka de (湯けむりの中で); 1987 
9) Kuso Miso Technique (くそみそテクニック); 1987 
10) Ore ga Ichiban Sexy (俺がいちばんセクシー); 1987 
11) Shissou Suru Kemonotachi (疾走する獣たち); 1987
 
Previously unpublished works in the second volume: 
1) Kizuna (絆) another story 
2) Gifu (義父) 
3) Showboy (ショーボーイ) 
4) Hen'ai: Shissou Suru Kemonotachi PART II (遍愛-疾走する獣たちPARTII-) 
5) Afterword