It may be covered under one Tokio Marine Explorer Essential International plan. The period of coverage shall start from the scheduled departure date from Johor, until the scheduled return date to Johor.
As illustration:
1 April: Travel from Johor to Singapore by Train
2 April: Travel from Singapore to Japan by Flight
10 April: Travel from Japan to Singapore by Flight
11 April: Travel from Singapore to Johor by Train
The policy effective date should be based on 1 April (i.e. the scheduled departure date out of Malaysia). On the other hand, the policy expiry date should be based on 11 April (i.e. the scheduled arrival date back to Malaysia).