|This game, video game or software features adult themes and/or content, and this article may make reference to that content for encyclopaedic purposes.|
Gunjo Gakuen (Deep Blue School) is a facility designed to gather and isolate those students who got a high score on an adaptation exam (Scoring high on this exam indicates that the student is less likely to be able to be adapted to the society) mandated by the government.
After a failed summer vacation with other members of the school's broadcasting club, Taichi and some other club members return to the city, only to find that all living creatures within it except for the club members have completely vanished. In order to confirm the status of the outside world, Taichi decides to gather other club members to help Misato Miyasumi, the president of broadcasting club, who is trying to set up a broadcasting antenna to contact any possible survivors. However, Taichi soon discovers that the world is actually repeating the week after they found the others vanished…
- Taichi Kurosu: the protagonist. He calls himself "Hentai the Great". He was trying to act as a human while hiding his score of 80+ points on the exam, which is almost beyond human boundaries.
- Miki Yamanobe: a girl with a cheerful character and small breasts.
- Kiri Sakura (Sakura is a family name): a squeamish girl who does not like Taichi. She is a good friend of Miki.
- Misato Miyasumi: a girl with glasses and large breasts. She is the president of the broadcasting club. She scored 30+ on the exam, which is unusually high.
- Touko Kirihara: a girl descended from Samurai. She used to be intimate with Taichi, but is now very harsh to him. "Kirihara" is an anagram of Harakiri.
- Youko Hasekura: a girl Ninja. She's always monitoring Taichi.
- Nanaka: a mysterious girl who wears a school uniform different from that of Gunjo Gakuen. She always suddenly appears or disappears in front of Taichi without warning.
Nanaca Crash!! (actually spelled NANACA†CRASH!!) is an online spinoff game featuring characters from Cross Channel. The object of the game is to click, hold and release the mouse button to determine the angle and velocity of Nanaka crashing her bicycle towards Taichi, sending him flying across the screen. Your score is determined by the distance of his flight. Certain characters he crashes into will greatly affect his velocity. It's now also available for iOS and Android with additional features.
|Name||Description||Notes||Unlocks||Google Play Games XP|
|Welcome!||You've crashed for the first time.||image: Nanaca on a bike||500|
|Crash course||Reach 1500m in one jump!||image: furious Touko Kirihara||500|
|Beginner||Reach 3000m in one jump!||image: Kiri Sakura with Miki Yamanobe in a swimming pool||1 000|
|Intermediate||Reach 7500m in one jump!||image: Misato Miyasumi||1 000|
|Expert||Reach 15000m in one jump!||image: Kiri Sakura together with Miki Yamanobe eating in the class||1 500|
|Marathon Runner||Reach 42195m in one jump!||Secret achievement||image: Youko Hasekura at the window||2 000|
|Launch Pad||Launch Taichi into heaven.||Launch 90 degrees to the sky||image: Nanaca on the bike crashing into Taichi||1 000|
|Perfect Crash||Unmatched accuracy in crashing.||Launch at 45 degrees and 100% power||image: everyone at the beach||1 000|
|Lifetime 10 km||Fly a total of 10 km!||Main menu theme music||music: Funczion Sounds - On Air||500|
|Lifetime 100 km||Fly a total of 100 km!||Game theme music||music: Funczion Sounds - Air Waves Arr.Ver||1 000|
|Lifetime 500 km||Fly a total of 500 km!||music: Funczion Sounds - Slapstick||1 500|
|Lifetime 1000 km||Fly a total of 1000 km!||music: Funczion Sounds - Air Waves||1 500|
|Touko Special||Perform Touko's special action 5 times.||animations: Touko||500|
|Miki Special||Perform Miki's special action 5 times.||animations: Miki||500|
|Kiri Special||Perform Kiri's special action 5 times.||animations: Kiri||500|
|Misato Special||Perform Misato's special action 5 times.||animations: Misato||500|
|Espionage Methods||Blocked by Youko 5 times in a game.||animations: Youko||500|
|Nobleman of Love||Perform all special actions in a game.||animations: Raba and Tomoki||1 500|
|Comic Force Field||Perform any 'Comic Force Field'.||Get blocked by Youko and then crash into some girl while distance is *9X (e.g. from 1290 to 1300m of distance)||animations: Nanaca||500|
|Grand Unification Theory||Perform all CFFs in a game.||Secret achievement. CFF seems to be random rather than depending on a girl.||image: all girls on school roof||2 000|
|Sudden Stop||Crash with Misato immegiately after the game starts.||Sometimes happens when launching at 0 degrees.||image: Taichi hugging Misato||1 000|
|Friendship is…||…selfless.||Secret achievement. Get crashed into Raba 5 times in a single game(?).||image: Raba||500|
|Speeding||Accelerated to 27.8 m/s.||Only horizontal speed matters. Voices are meant to be used for ringtones, etc(how?).||voice: Miki||500|
|As fast as light||Accelerated to 83.3 m/s.||Nanaca's aerial crashes can be used to gain speed without touching the ground.||voice: Kiri||1 500|
|Tsutenkaku||Jump to an altitude of over 100 meters.||Nanaca's aerial crashes can be used to gain altitude without touching the ground.||voice: Touko||500|
|Radio Tower||Jump to an altitude of over 332.6 meters.||voice: Misato||1 500|
|Karade Beginner||Boost 4 times without hitting the ground.||voice: Tomoki||500|
|Master of Karade||Boost 6 times without hitting the ground.||voice: Sakuraba||1 000|
|Secrets of Karade||Boost 10 times without hitting the ground.||Secret achievement.||voice: Youko||2 000|
|Our Little Present||Complete the tutorial.||image: everyone together||500|
|Evangelist||Post your record to twitter.||image: Taichi in gas mask with some girl||1 000|