Takayama enters the training program of JNR with the ambition of becoming one of the venerable train company's engineers. As a trainee he is teamed up with fight-ready Sakurai and stolid Iwaizumi and fellow Haruka Kōmi who has encyclopedic knowledge of trains. Together they learn how security officers for the train line work and get involved in more than one tricky situation.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Welcome to K4! | 2014-07-04 | 25 min |
| Season 1 | Episode 2 | Just Let Me for a Little | 2014-07-11 | 25 min |
| Season 1 | Episode 3 | It Was Cool | 2014-07-18 | 25 min |
| Season 1 | Episode 4 | I Think I'm in Love | 2014-07-25 | 25 min |
| Season 1 | Episode 5 | Quit Staring | 2014-08-01 | 25 min |
| Season 1 | Episode 6 | I'll Protect You. | 2014-08-08 | 25 min |
| Season 1 | Episode 7 | You Look Good in That. | 2014-08-15 | 25 min |
| Season 1 | Episode 8 | I'll Do It! | 2014-08-22 | 25 min |
| Season 1 | Episode 9 | Thank You | 2014-08-29 | 25 min |
| Season 1 | Episode 10 | Will You Keep It a Secret? | 2014-09-05 | 25 min |
| Season 1 | Episode 11 | Count Me In | 2014-09-12 | 25 min |
| Season 1 | Episode 12 | Everyone's Waiting | 2014-09-19 | 25 min |
| Writing | Toyoda Takumi | Original Story |
| Sound | Yoshiaki Fujisawa | Original Music Composer |
| Visual Effects | Sayaka Koiso | Supervising Animation Director |
| Directing | Yoshifumi Sueda | Series Director |
| Art | Yukihiro Watanabe | Art Direction |
