合う => do something together N3
~こと請け合い => I guarantee ... N1
Happens next
最中に => while; during; in the middle of ~ N3
[合「あ」]う => To do A together/mutually N4
Secondary Verb
場合(は) => in the event of; in the case that ~ N4
〜がさいご(が最後) => if you do... negative result N1
Decisive (resolute decision)
~ににあわず (に似合わず ) => ~Different from N1
Evaluate
[最中「さいちゅう」] => In the middle of A N3
Time, Situation
たが[最後「さいご」] => Once A occurs, B happens N1
Information, Report