High school baseball in Japan

Known in Japanese as 春夏連続優勝, haru-natsu renzoku yuusho or Spring-Summer Consecutive Champions, this signifies the winning of the senbatsu (Spring) and natsu (Summer) tournaments in a calendar year. To date there have been 8 instances of such a feat:

Before World War II, teams from Taiwan, Korea, and Manchuria, which were all part of the Japanese Empire at the time, participated in the tournaments (in the spring only Taiwan took part). The first overseas teams to participate were Pusan Commercial School of Korea and Dalian Commercial School of Manchuria in the 1921 Summer Kōshien. Foreign teams have made it as far as the championship game, but have never won the tournament. The last tournament including foreign teams was the 1940 Spring Kōshien.

Currently, the maximum number of times a player can appear in Kōshien is five. However, under the old secondary school system, a player could appear more than five times. Here are two examples.

The tournament was suspended due to the war from summer 1941 until spring 1946, with the exception of a "Promote the Fighting Spirit" tournament held by the Ministry of Education in 1942 at Kōshien. The number of teams was only 16 compared with 23 at the previous tournament, but each region held qualifying tournaments and sent teams to a national tournament. The military theme was prevalent at the tournament, with military slogans posted on the scoreboard, and names on uniforms previously written in trendy Roman alphabet letters replaced by traditional Japanese kanji characters. The tournament proceeded smoothly and Tokushima Commercial (Tokushima) won the championship. However, since this tournament differed from past Summer Kōshiens hosted by Asahi Shimbun it is not counted as an official Kōshien tournament.

In the 1937 Summer Kōshien, Kumamoto Tech (Kumamoto) advanced to the championship game, but lost. After the game, Kumamoto Tech player Tetsuharu Kawakami grabbed a handful of dirt from the playing field of Kōshien Stadium and put it in his uniform pocket as a memento. Some years later, in the 1949 Summer Kōshien, after Kokura High (Fukuoka) lost to Kurashiki Tech (Okayama) in the semifinals, Kokura pitcher Kunio Fukushima scooped up some Kōshien dirt and took it home. This has become known as the original scooping of "the dirt of Kōshien" (甲子園の土, Kōshien no tsuchi). Since then, as a memento of their fleeting time on the hallowed grounds of Kōshien, players from the losing teams take home a pouch of the precious soil.

At the 1958 Summer Kōshien, Shuri High (Okinawa) became the first school to represent Okinawa (then under U.S. government rule) in a Kōshien tournament. They were eliminated in their first game by Tsuruga High (Fukui). After the game, they collected souvenirs of dirt and took them home. However, due to quarantine regulations of the Ryūkyū government they were not allowed to keep the dirt, and it was confiscated. Some Japan Airlines flight attendants heard about this, and had a sea stone lying outside Kōshien Stadium sent to Shuri. Even today this "Monument of Friendship" lies in the yard of the school as a reminder of the first trip to Kōshien by a team from Okinawa.

In the past, if a scandal was uncovered at a high school chosen to participate in the Kōshien, the school was forced to withdraw from competition in the tournament. A team's participation in the tournament was affected even by scandals not related to team members. However, recently, such unrelated incidents have had less effect on a team's participation.

Denials of Kōshien participation based on circumstances other than scandals have also occurred. In the 1922 summer tournament, Niigata Commercial High School's denial was based on a star player's illness.

This term is based on the barrier built in Shirakawa, Fukushima. No team north of the northern Kantō region had ever won a tournament at Kōshien. This fact became known in the high school baseball world as the "Shirakawa Barrier". At the 2004 Summer Kōshien, Komazawa University Tomakomai High (southern Hokkaidō) took the title, and in one bound leaped over not only the Shirakawa Barrier but also the Tsugaru Strait separating Hokkaido from Honshū. On the plane carrying the team and championship flag back home, at the moment the plane crossed the Tsugaru Strait, the passengers joined in unison for a celebration cheer.

In 2005, Komazawa University Tomakomai High won a second straight Summer Kōshien title, becoming the first to do so since Kokura Secondary (Fukuoka) in 1947–48. This title was tainted after the tournament, however, by reports of repeated incidents of physical punishment of one of the players, once during the tournament, by the baseball club advisor (a 27-year-old school faculty member). Besides a reprimand for withholding the report until after the tournament, the High School Baseball Federation did not punish Komazawa Tomakomai. However, the report drew widespread attention to the issue of physical punishment in youth sports in Japan. It is believed that such physical punishment probably goes heavily underreported, due to cultural tendencies.

As mentioned above, Komawaza University Tomakomai (aka Komadai Tomakomai) won the 2004 Summer Koshien, becoming the northern-most school to win since Sakushin Gakuin (Tochigi). However, the route traveled by the championship flag from Koshien to Hokkaidō did not actually pass through the Shirakawa Barrier by land, so many fans (especially in the Tōhoku region) believe that the barrier has technically not yet been broken.

In high school baseball jargon, a championship by a school in the region from Kanagawa to Tochigi.

During the Edo period, Shirakawa and Hakone were both strategic checkpoints and official passes were needed to pass through, thus leading to these names.

The first team to "pass Hakone" was Keio Futsūbu (Tōkyō). After that, Shōnan High (Kanagawa) won in summer of 1949. Despite the fact that Keio Futsūbu won in summer of 1916, the victory by Shonan High in 1946 is known as the first "passing of Hakone". Reasons for this include the fact that 33 years had passed since the Keio Futsūbu and Shonan High victories, the fact that western Japanese teams were seen as stronger than eastern Japanese teams at the time of Shonan High's victory, and the fact that high school baseball was not yet well known in 1916. The first spring passing of Hakone was achieved by Waseda Jitsugyō (Tōkyō) led by pitcher and future pro baseball legend Sadaharu Oh in 1957.

Also, the "fording of the Tone River" in northern Kantō has also been achieved.

Since the victory of Waseda Jitsugyō, championships by Kantō teams have become more frequent and as a result these terms have fallen out of use.

In high school baseball jargon, when a team from Kyūshū wins a tournament. The first to "cross the Kanmon Straits" was Kokura Secondary in the 1947 Summer Kōshien. Coincidentally, Kokura Secondary repeated as champions in 1948, a feat not matched until Komadai Tomakomai also became the first team to bring the title to their region then repeated the following year.

Based on Mount Aso in Kumamoto. In high school baseball jargon, when a team from the southern half of Kyūshū wins the tournament. The first to "pass the Mountain of Aso" was Seiseikō High (Kumamoto) in the 1958 Spring Kōshien. This has not yet been achieved in the Summer Kōshien.

In high school baseball jargon, when a team from Okinawa wins a tournament. The first to "cross the ocean" was Okinawa Shōgaku (Okinawa) in the spring of 1999, and Konan (Okinawa) achieved the first summer championship in 2010.

In high school baseball jargon, when a team from the Hokuriku region wins a tournament. To date no team has achieved this. Fukui Commercial High (Fukui) in the 1978 Spring Kōshien and Seiryō (Ishikawa, alma mater of Hideki Matsui) in the 1997 Summer Kōshien reached the semifinals. More recently, Nihon Bunri (Niigata, Niigata) reached the finals in 2009, and made an amazing comeback from down 10-4 in the bottom of the 9th with 2 outs to make it 10-9 before catcher Naoki Wakabayashi lined out to 3rd to end the game.