合う => do something together N3
~こと請け合い => I guarantee ... N1
Happens next
[合「あ」]う => To do A together/mutually N4
Secondary Verb
場合(は) => in the event of; in the case that ~ N4
~ににあわず (に似合わず ) => ~Different from N1
Evaluate
させてください/させてもらえますか/させてもらえませんか => please let me do N3
せいか => perhaps because ~ N2
せいで/せいか => Because of A, B N3
Reason, Result, Response
せいにする => Blame... N2
Cause, reason
させていただけませんか => Could you please let me do... N4
せいだ => because of; due to N3
Cause, reason
させてあげる => (Allow) N4
Allow