~こと請け合い => I guarantee ... N1
Happens next
合う => do something together N3
[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
~しいしい => Every once in a while... (Repeat situation) N1
Repetition, habit
らしい => It looks like N3
Situation
いたします => to do (polite form of します) N4
てもよろしいでしょうか => May I... N4
Allow
いつしか => before one knows N2
Accept, agree
しか~ない => only; nothing but N4
だけしか~ない => only N3